Transient surface photovoltage measurement over 12 orders of magnitude in time

Thomas Dittrich; Steffen Fengler; Michael Franke

doi:10.1063/1.4983079

Transient surface photovoltage measurement over 12 orders of magnitude in time

Rev Sci Instrum. 2017 May;88(5):053904. doi: 10.1063/1.4983079.

Authors

Thomas Dittrich¹, Steffen Fengler², Michael Franke³

Affiliations

¹ Helmholtz-Zentrum Berlin für Materialien und Energie GmbH, Institut für Silizium-Photovoltaik, Kekuléstr. 5, D-12489 Berlin, Germany.
² Helmut-Schmidt-Universität, Institut für Werkstofftechnik, Holstenhofweg 85, D-22043 Hamburg, Germany.
³ Elektronik-Manufaktur Mahlsdorf, Paul-Wegener-Str. 36, D-12623 Berlin, Germany.

PMID: 28571417
DOI: 10.1063/1.4983079

Abstract

The measurement of transient surface photovoltage (SPV) signals in a fixed capacitor arrangement over 12 orders of magnitude in time has been demonstrated for a SnO₂:F/TiO₂/In₂S₃ layer system under high vacuum. For this purpose, a high impedance buffer with a bandwidth above 200 MHz and an effective input resistance of 200-700 TΩ has been developed. Fast separation of photo generated charge carriers within ns and very slow relaxation of SPV signals excited with short laser pulses and the measurement of SPV spectra under continuous illumination with a halogen lamp were demonstrated.