Veröffentlichungen
Forschungsbereich Integrierte Schaltungen

 

Übersicht aller Veröffentlichungen:

2017:

  • A. Seidel, B. Wicht: A 1.3A Gate Driver for GaN with Fully Integrated Gate Charge Buffer Capacitor Delivering 11nC Enabled by High-Voltage Energy Storing. In 2017 IEEE International Solid-State Circuits Conference Digest of Technical Papers (ISSCC2017), San Francisco, Feb. 5-9, 2017, pp. 432-433.

 

2016:

  • B. Wicht, J. Wittmann, A. Seidel, A. Schindler: High-Voltage Fast-Switching Gate Drivers, in Wideband Continuous-time ΣΔ ADCs, Automotive Electronics, and Power Management, Advances in Analog Circuit Design 2016, Eds. A. Baschirotto, P. Harpe, K. Makinwa, Springer International Publishing, pp. 155-176, 2017, ISBN: 978-3-319-41669-4.
  • S. Quenzer-Hohmuth, T. Rosahl, S. Ritzmann, B. Wicht: Challenges and implementation aspects of switched-mode power supplies with digital control for automotive applications. Advances in Radio Science, vol. 14, Kleinheubacher Berichte 2015, pp. 85 – 90, doi:10.5194/ars-14-85-2016.
  • P. Renz, B. Wicht: A 40V Current Sensing Circuit with Fast on/off Transition for High-Voltage Power Management. In MWCAS 2016, Proc. 59th International Midwest Symposium on Circuits and Systems, Abu Dhabi, United Arab Emirates, pp. xx-yy, Oct. 16-19, 2016.
  • D. Lutz, P. Renz, B. Wicht: A 120/230 Vrms-to-3.3V Micro Power Supply with a Fully Integrated 17V SC DCDC Converter. In ESSCIRC 2016, Proc. 42nd European Solid-State Circuits Conference, Lausanne, Switzerland, pp. 449-452, Sept. 12-15, 2016. DOI: 10.1109/ESSCIRC.2016.7598338.
  • A. Schindler, B. Koeppl, A. Pottbaecker, M. Zannoth, B. Wicht: Gate Driver with 10 / 15ns In-Transition Variable Drive Current and 60% Reduced Current Dip. In ESSCIRC 2016, Proc. 42nd European Solid-State Circuits Conference, Lausanne, Switzerland, pp. 325-328, Sept. 12-15, 2016. DOI: 10.1109/ESSCIRC.2016.7598308.
  • J. Hackel, A. Seidel, J. Wittmann, B. Wicht, Capacitive Gate Drive Signal Transmission with Transient Immunity up to 300 V/ns, ANALOG 2016, 15. ITG/GMM-Fachtagung, Bremen, VDE VERLAG, pp. 53-57, Sept. 12-14, 2016. ISBN 978-3-8007-4265-3.
  • Chr. Rindfleisch, B. Wicht, Efficiency Impact of Air-Cored Inductors in Multi-MHz Power Converters, 18th European Conference on Power Electronics and Applications (EPE'16 ECCE Europe), Karlsruhe, Germany, Sept. 5-9, 2016, pp. 1-8, DOI: 10.1109/EPE.2016.7695433.
  • J. Wittmann, A. Barner, T. Rosahl, B. Wicht: An 18V Input 10MHz Buck Converter with 125 ps Mixed-Signal Dead Time Control. In IEEE Journal of Solid-State Circuits, vol. 51, pp. 1705-1715, July 2016.
  • S. Quenzer-Hohmuth, C. Jiago, T. Rosahl, S. Ritzmann, B. Wicht: Delay-Line Analog-Digital-Wandler mit geringer Latenzzeit für digital geregelte Schaltwandler, 56. MPC Workshop, Weingarten, Germany, pp. xx-yy, July 8, 2016. ISSN 1868-9221.
  • S. Quenzer-Hohmuth, T. Rosahl, S. Ritzmann, B. Wicht: Controller-Adaption to the Load in Boost Converter for Improved Transient Response, 12th Conference on Ph.D. Research in Microelectronics and Electronics (PRIME 2016), Lisbon, Portugal, pp. 1-4, June 27-30, 2016. DOI: 10.1109/PRIME.2016.7519468.
  • B. Wicht, J. Wittmann, A. Seidel, A. Schindler: High-Voltage Fast-Switching Gate Drivers, Advances in Analog Circuit Design (AACD 2016), Villach, Austria, pp. 157-178, April 26-28, 2016.
  • A. Barner, J. Wittmann, T. Rosahl, B. Wicht: A 10 MHz, 48-to-5V Synchronous Converter with Dead Time Enabled 125 ps Resolution Zero-Voltage Switching. In APEC 2016, 31st Annual IEEE Applied Power Electronics Conference and Exposition, Long Beach, US, pp. 106-110, March 20-24, 2016. DOI: 10.1109/APEC.2016.7467859.
  • T. Funk, P. Renz, B. Wicht: Vollintegrierte 160MHz Strommessung mit On-chip Rogowski Spule, 18. Workshop Analogschaltungen 2015, Leibniz Universität Hannover, pp. 8-9, March 03-04, 2016.
  • D. Lutz, P. Renz, B. Wicht: A 10mW Fully Integrated 2-to-13V-Input Buck-Boost SC Converter with 81.5% Peak Efficiency. In 2016 IEEE International Solid-State Circuits Conference Digest of Techical Papers (ISSCC2016), San Francisco, Feb. 2016.

 

2015:

  • A. Schindler, B. Koeppl, B. Wicht: EMC and Switching Loss Improvement for Fast Switching Power Stages by di/dt, dv/dt Optimization with 10ns Variable Current Source Gate Driver, EMC Compo 2015, 10th International Workshop on Electromagnetic Compatibility of Integrated Circuits, Edinburgh, U.K., pp. 18-23, Nov. 10-13, 2015.
  • J. Wittmann, A. Barner, Th. Rosahl, B. Wicht: A 12V 10MHz Buck Converter with Dead Time Control Based on a 125 ps Differential Delay Chain. In ESSCIRC 2015, Proc. 41st European Solid-State Circuits Conference, Graz, Austria, Sept. 14-18, 2015, in press.
  • A. Seidel, M. Costa, B. Wicht: Hochintegrierter galvanisch getrennter Gatetreiber mit induktiver Energie- und Signalübertragung geeignet für 600V-Anwendungen, 17. Workshop Analogschaltungen 2015, Technische Universität Darmstadt, March 05-06, 2015.
  • P. Renz, D. Lutz, B. Wicht: Vollintegrierter Low Power SC DC-DC Wandler mit großem Eingangs­spannungs­bereich 5-20 V, 17. Workshop Analogschaltungen 2015, Technische Universität Darmstadt, March 05-06, 2015.
  • D. Lutz, P. Renz, B. Wicht: Low Power SC Wandler mit hoher variabler Eingangsspannung, 53. MPC Workshop, Esslingen, Germany, Seite 7-12, 06. Feb. 2015.
  • M. Kilian, J. Joos, B. Wicht: A 3.6kW Efficiency and Switching Frequency Improved DC-DC-Converter Design with Optimized Mounting and Interconnect Technology, In Proceedings PCIM 2015, International Exhibition and Conference for Power Electronics, Intelligent Motion, Renewable Energy and Energy Management, Nuremberg, Germany, VDE Verlag, pp. 421-428, May 19-21, 2015, ISBN 978-3-8007-3924-0 / ISSN 2191-3358.
  • A. Seidel, M. Costa, J. Joos, B. Wicht: Area Efficient Integrated Gate Drivers Based on High-Voltage Charge Storing. In IEEE Journal of Solid-State Circuits, vol. 50, pp. 1550-1559, July 2015.
  • J. Wittmann, B. Wicht: A Configurable Sawtooth Based PWM Generator with 2 ns On-Time for >50 MHz DCDC Converters, 11th Conference on Ph.D. Research in Microelectronics and Electronics (PRIME 2015), Glasgow, U.K., pp. 41-44, June 29 - July 2 2015. DOI: 10.1109/PRIME.2015.7251089.
  • T. Funk, J. Wittmann, B. Wicht: A 20 V, 8 MHz Resonant DCDC Converter with Predictive Control for 1 ns Resolution Soft-Switching. In Proc. 2015 IEEE International Symposium on Circuits and Systems (ISCAS), Lisbon, Portugal, pp. 1742 - 1745, May 24-27, 2015. DOI: 10.1109 / ISCAS.2015.7168990.
  • J. Wittmann, Chr. Rindfleisch, B. Wicht: Substrate Coupling in Fast-Switching Integrated Power Stages, IEEE 27rd International Symposium on Power Semiconductor Devices and ICs (ISPSD), pp. 341 - 344, May 10– 14, 2015. DOI: 10.1109/ISPSD.2015.7123459.
  • Seidel, M. Costa, J. Joos, B. Wicht: Isolated 100% PWM Gate Driver with Auxiliary Energy and Bidirectional FM/AM Signal Transmission via Single Transformer. In APEC 2015, Thirtieth Annual IEEE Applied Power Electronics Conference and Exposition, Charlotte, North Carolina, US, p. 2581 - 2584, March 15-19, 2015. DOI: 10.1109/APEC.2015.7104715.

 

2014:

  • J. Wittmann, B. Wicht: Efficiency Modeling for MHz DCDC Converters at 40V Input Voltage Range. In Advances on Radio Science, Kleinheubacher Berichte 2013, p. 111 - 115.
  • A. Seidel, M. Costa, J. Joos, B. Wicht: Bootstrap Circuit with High-Voltage Charge Storing for Area Efficient Gate Drivers in Power Management Systems. In ESSCIRC 2014, Proc. 40th European Solid-State Circuits Conference, Venice, Italy, p. 159 - 162, Sept. 22-26, 2014.
  • J. Wittmann, Th. Rosahl, B. Wicht: High Speed Level Shifter for Multi-MHz Converters with High Input Voltage. In ESSCIRC 2014, Proc. 40th European Solid-State Circuits Conference, Venice, Italy, p. 151 - 154, Sept. 22-26, 2014.
  • J. Wursthorn, H. Knapp, B. Wicht: A Millimeter-Wave Power Amplifier Concept in SiGe BiCMOS Technology for Investigating HBT Physical Limitations, In 51th MPC Workshop, Künzelsau, Germany, July 11, 2014, in press.
  • Chr. Rindfleisch, J. Wittmann, B. Wicht: Substratkoppeln in schnell schaltenden integrierten Leistungsendstufen, In 51th MPC Workshop, Künzelsau, Germany, July 11, 2014, in press.
  • A. Seidel, J. Wittmann, B. Wicht: Ein Effizienzmodell für getaktete Schaltwandler im Multi−MHz−Bereich, In Workshop der ASIM/GI-Fachgruppen, Tagungsband, Reutlingen, 20./21. Februar 2014.

 

2013:

  • A. Schindler, B. Koeppl, B. Wicht: EMC Analysis of Current Source Gate Drivers, EMC Compo 2013, 9th International Workshop on Electromagnetic Compatibility of Integrated Circuits, Proceedings, pp. 101-106, Nara, Japan, 15-18 Dec. 2013.
  • Wittmann, J.; Neidhardt, J.; Wicht, B., "EMC Optimized Design of Linear Regulators Including a Charge Pump," IEEE Transactions on Power Electronics, vol.28, no.10, pp.4594-4602, Oct. 2013
  • P. Gottschling, T. Rosahl, B. Wicht: Analyse des SEPIC-Spannungswandlers für Automotive-Anwendungen, In 50th MPC Workshop, Konstanz, Germany, pp. 31-36, July, 2013.
  • Wittmann, J.; Wicht, B., "MHz-Converter Design for High Conversion Ratio," Power Semiconductor Devices and ICs (ISPSD), 2013 IEEE 25rd International Symposium on, pp. 127-130, 26-30 May 2013
  • Ehrhart, A.; Wicht, B.; Chen, K-H.; et al. " Adaptive Pulse Skipping and Adaptive Compensation Capacitance Techniques in Current-Mode Buck-Boost DC-DC Converters for Fast Transient Response," IEEE 10th International Conference on Power Electronics and Drive Systems (PEDS), 2013, pp. 373 - 378, 22-25 Apr. 2013
  • Andreas Ehrhart, Bernhard Wicht, Ke-Horng Chen; A Current-Mode Buck-Boost DC-DC Converter with Fast Transient Response. 49th MPC Workshop, Mannheim, Feb. 08, 2013
  • Wittmann, Jürgen; Funk, Tobias; Wicht, Bernhard: Gate Driver Design for Fast Switching DC-DC Converters. In MIKROELEKTRONIK, 25 Jahre Multi-Projekt-Chip-Gruppe, Gerhard Forster (Hrsg.), Ulm, 2013, Seite 78-85, ISBN 978-3-9810998-6-7.
  • Ehrhart, Andreas; Wicht, Bernhard; Chen, Ke-Horng: A Current-Mode Buck-Boost DC-DC Converter with Fast Transient Response. In MIKROELEKTRONIK, 25 Jahre Multi-Projekt-Chip-Gruppe, Gerhard Forster (Hrsg.), Ulm, 2013, Seite 86-91, ISBN 978-3-9810998-6-7.

 

2012:

  • Wittmann, Jürgen; Funk, Tobias; Wicht, Bernhard: Gate Driver Design for Fast Switching DC-DC Converters. In 48th MPC Workshop, Aalen, July 06, 2012, pp. 17-24.

 

2011:

  • J. Wittmann, B. Wicht: EMC Optimization of Linear Regulators with a Charge Pump – Design, Simulation and Measurements. In 46. MPC-Workshop, Furtwangen, Germany, 08. Juli 2011, pp. 91-96.
  • J. Wittmann, B. Wicht: EMC Influence of the Charge Pump in Linear Regulators – Design, Simulation and Measurements. In Proc. 2011 IEEE International Symposium on Circuits and Systems (ISCAS) , Rio de Janeiro, Brazil, May 15-18, 2011, pp. 1359 - 1362.
  • B. Wicht: Integrated Analog and Smart Power Circuit Design. In Proceedings NPIE/Stuttgart/Reutlingen Workshop on Emerging Technology for Power Electronics, Hsinshu, Taiwan, 27.06.2011, pp. 61-71.
  • M. Wendt, L. Thoma, B. Wicht: Integrierte Schaltungsvorrichtung. Deutsches Patent- und Markenamt, Patentschrift, DE 10 2007 002 377 B4, 01. Dezember 2011.
  • St. Herzer, F. Stettner, B. Wicht: Elektronische Vorrichtung und Verfahren zur effizienten Pegel­verschiebung, Deutsches Patent- und Markenamt, Patentschrift, DE 10 2009 037 486, 28. Juli 2011.
  • M. Augustyniak, B. Wicht: Circuit for Compensation of Leakage Current - Induced Offset. United States Patent, US000007907015B2, 15.03.2011.

 

2010:

  • M. Augustyniak, B. Wicht, I. Hehemann: Low-leakage switch for sample and hold, United States Patent 7812646, 12.10.2010
  • M. Wendt, L. Thoma, B. Wicht: High side/low side driver device for switching electrical loads. United States Patent 7724046, 25.05.2010

 

2009:

  • S. Herzer, S. Kulkarni, M. Jankowski, J. Neidhardt, B. Wicht: Capacitive-coupled Current Sensing and Auto-ranging Slope Compensation for Current Mode SMPS with Wide Supply and Frequency Range. In ESSCIRC 2009, Proc. 35th European Solid-State Circuits Conference, Athens, Greece, Sept. 14-18, 2009.
  • L. E. Dake, B. Wicht, M. Wendt: Flyback Current Control. United States Patent 7548097, June 16, 2009.
  • M. Augustyniak, B. Wicht, I. Hehemann: Schalter mit niedrigem Stromverlust zum Abtasten und Halten. Deutsches Patent- und Markenamt, Patentschrift, DE102007048453B3, 10. Juni 2009.
  • M. Augustyniak, B. Wicht: Schaltkreis zur Kompensation von leckstrominduziertem Offset in einem asymmetri­schen Operationsverstärker. Deutsches Patent- und Markenamt, Patentschrift, DE102007048454B3, 19. März 2009. (Internationale Anmeldung: Circuit for Compensation of Leakage Current - Induced Offset. United States Patent Application, US020100148875A1, 10.10.2008)
  • S. Herzer, S. Kulkarni, J. Neidhardt, B. Wicht: Geschaltete Spannungsversorgung mit Stromabtastung. Deutsches Patent- und Markenamt, Patentanmeldung, DE102009012767A1, 12.03.2009. (Internationale Anmeldung: Switched Mode Power Supply with Current Sensing, United States Patent Application, US020100231187A1, 10.03.2010)
  • M. Augustyniak, B. Wicht: Ladungspumpe mit Selbsttaktung und Verfahren. Deutsches Patent- und Markenamt, Patentanmeldung, DE102009010550A1, 25.02.2009. (Internationale Anmeldung: Charge pump with self-timing and method, United States Patent Application, US020100264981A1, 23.02.2010)
  • B. Wicht, Th. Nirschl, and Y. Martelloni: SRAM memory cell and method for compensating a leakage current. United States Patent 7504695, March 17, 2009.

 

2008:

  • M. Wendt, L. Thoma, B. Wicht, D. Schmitt-Landsiedel: A Configurable High-Side/ Low-Side Driver with Fast and Equalized Switching Delay. In IEEE Journal of Solid-State Circuits, vol. 43, pp. 1617-1625, July 2008.

 

2007:

  • M. Wendt, L. Thoma, B. Wicht, D. Schmitt-Landsiedel: A Configurable High-Side/ Low-Side Driver. In ESSCIRC 2007, Proc. 33th European Solid-State Circuits Conference, Munich, Germany, Sept. 11-13, 2007, pp. 256-259.
  • M. Wendt, L. Thoma, B. Wicht: Integrierte Schaltungsvorrichtung. Deutsches Patent- und Markenamt, Patentanmeldung, DE102007002377A1, 16. Januar 2007. (M. Wendt, L. Thoma, B. Wicht: High side/low side driver device for switching electrical loads. United States Patent 7724046, 25.05.2010)

 

2006:

  • B. Wicht, D. Schmitt-Landsiedel und J.-Y. Larguier: Differential Current Evaluation Circuit. United States Patent 7099218, 29. August 2006.

 

2004:

  • B. Wicht, Th. Nirschl, and D. Schmitt-Landsiedel: Yield and Speed Optimization of a Latch-Type Voltage Sense Amplifier. In IEEE Journal of Solid-State Circuits, vol. 39, pp. 1148-1158, July 2004.
  • B. Wicht, Th. Nirschl, and Y. Martelloni: SRAM-Speicherzelle mit Mitteln zur Erzielung eines vom Speicherzustand unabhängigen Leckstroms. Deutsches Patent- und Markenamt, Patentschrift, DE10255102 B3, 29. April 2004. (Internationale Anmeldungen: SRAM memory cell and method for compensating a leakage current. United States Patent 7504695, March 17, 2009; SRAM memory cell and method for compensating a leakage current. China-Patent, CN000100557707C, 04.11.2009)

 

2003:

  • B. Wicht, J.-Y. Larguier, and D. Schmitt-Landsiedel: A 1.5V 1.7ns 4kx32 SRAM with a Fully-Differential Auto-Power-Down Current Sense Amplifier. In 2003 IEEE International Solid-State Circuits Conference Digest of Techical Papers, San Francisco, Feb. 2003.
  • B. Wicht, Th. Nirschl, D. Schmitt-Landsiedel: A Yield-Optimized Latch-Type SRAM Sense Amplifier. In ESSCIRC 2003, Proc. of the 29th European Solid-State Circuits Conference, Estoril, Portugal, Sept. 16-18, 2003, pp. 409-412.
  • B. Wicht: Current Sense Amplifiers for Embedded SRAM in High-Performance System-on-a-Chip Designs. Springer Verlag, Heidelberg, 2003.
  • B. Wicht und D. Schmitt-Landsiedel: Speicher. Deutsches Patent- und Markenamt, Patentschrift, DE10156728C2, 27. November 2003.
  • B. Wicht, D. Schmitt-Landsiedel und J.-Y. Larguier: Differentielle Strombewerterschaltung und Leseverstärkerschaltung zum Bewerten eines Speicherzustands einer SRAM-Halbleiterspeicherzelle. Deutsches Patent- und Markenamt, Patentschrift, DE 102 19 649 C1, 27. Nov. 2003. (Internationale Anmeldungen: Differential current sense amplifier circuit, Japan Patent, JP002003323800AA, 14. Nov. 2003. European Patent, EP000001365413A3, 01.06.2005. Differential Current Evaluation Circuit. United States Patent 7099218, 29. August 2006.)
  • Wicht and S. Paul: Electronics Amplifier Circuit Having a Switchable Input Transistor. United States Patent 6512713, 28. Januar 2003.

 

2002:

  • B. Wicht, S. Paul und I. Martiny: Auskoppelschaltung für die Signale integrierter Photodioden. Deutsches Patent- und Markenamt, Patentschrift, DE 10053955C1, 05. September 2002.
  • B. Wicht und S. Paul: Verstärkerschaltungsanordnung. Deutsches Patent- und Markenamt, Patentschrift, DE 100 23 362 C2, 10. Oktober 2002. (Internationale Anmeldung: Amplifier Circuit. United States Patent 6466500, 15. Oktober 2002.)
  • B. Wicht and S. Paul: Electronic Amplifier with a Switchable Input Transitor. European Patent, EP000118466A3, 06. Nov. 2002. (Internationale Anmeldung: Electronics Amplifier Circuit Having a Switchable Input Transistor. United States Patent 6512713, 28. Januar 2003.)

 

2001:

  • B. Wicht, I. Martiny, D. Schmitt-Landsiedel, S. Paul, and A. Sanders: Speeding up CMOS cameras and optical receivers by improved column multiplexer. In Optoelectronic Integrated Circuits and Packaging V, Proceedings of SPIE Vol. 4290, pp. 28-37, San Jose, 2001.
  • B. Wicht, D. Schmitt-Landsiedel, S. Paul, and A. Sanders: SRAM Current-Sense Amplifier with Fully-Compensated Bit Line Multiplexer. In 2001 IEEE International Solid-State Circuits Conference Digest of Techical Papers, San Francisco, Feb. 2001, pp. 172-173.
  • B. Wicht, D. Schmitt-Landsiedel, and S. Paul: A Simple Low Voltage Current Sense Amplifier with Switchable Input Transistor. In ESSCIRC 2001, Proc. of the 27th European Solid-State Circuits Conference, Villach, Austria, Sept. 18-20, 2001, pp. 300-303.
  • Th. Nirschl, B. Wicht, and D. Schmitt-Landsiedel: High Speed, Low Power Design Rules for SRAM Precharge and Self-timing under Technology Variations. In Power And Timing Modeling, Optimization and Simulation 2001, Proceedings of the 11th Intern. Workshop, Yverdon-les-Bains, Switzerland, Sept. 2001, pp. 7.3.1-7.3.10.
  • B. Wicht, S. Paul, and D. Schmitt-Landsiedel: Analysis and Compensation of the Bitline Multiplexer in SRAM Current Sense Amplifiers. In IEEE Journal of Solid-State Circuits, vol. 36, pp. 1745-1755, Nov. 2001.

 

2000:

  • I. Martiny, B. Wicht: Integrierter Bildaufnehmer für das Kohärenzradar. In tm - Technisches Messen - Sensoren, Geräte, Systeme (Oldenburg Verlag), 67. Jahrgang, Nr. 2, S. 63-69, Feb. 2000.
  • I. Martiny, R. Leuner and B. Wicht: Cross-talk reduction and efficiency of integrated photodiodes shown by an integrated edge detector. In Photonics West Conference, Proceedings of SPIE, Vol. 3950, Eds.: Y. Park et al., pp. 39 - 48, San Jose, Jan. 2000.

 

1999:

  • J. Seekamp, J. Niemann, B. Wicht und W. Bauhofer: Integrierte Optik auf Silizium: UV-Sensoren in ASIC kompatibler Technologie. In Multi-Nature Systems: Optoelektronische, mechatronische und sonstige gemischte Systeme, Jena, Februar 1999.
  • J. Seekamp, J. Niemann, B. Wicht and W. Bauhofer: ASIC Compatible Amorphous Silicon Carbon UV-Sensor Technology. In Sensor 99, 9th Int'l Trade Fair and Conference for Sensors, Transducers & Systems, Proceedings, Vol. 2, Nürnberg, May 1999.
  • B. Wicht, R. Leuner, I. Martiny, and M. Stoltz: A Novel High-Precision, High-Speed Optical Edge Detector. In Sensor 99, 9th Int'l Trade Fair and Conference for Sensors, Transducers & Systems, Proceedings, Vol. 1, Nürnberg, May 1999.

 

1998:

  • J. Seekamp, O. Liepelt, J. Henneberg, B. Wicht, J. Niemann und W. Bauhofer: A-Si1-xCx:H Dünnschichten als Szintillatorfläche in UV-Sensoren. In Frühjahrstagung der Deutschen Physikalischen Gesellschaft, Regensburg, März 1998.