TY  - JOUR
AU  - Krückemeier, Lisa
AU  - Liu, Zhifa
AU  - Kirchartz, Thomas
AU  - Rau, Uwe
TI  - Quantifying Charge Extraction and Recombination Using the Rise and Decay of the Transient Photovoltage of Perovskite Solar Cells
JO  - Advanced materials
VL  - 35
IS  - 35
SN  - 0935-9648
CY  - Weinheim
PB  - Wiley-VCH
M1  - FZJ-2023-02038
SP  - 2300872
PY  - 2023
AB  - The extraction of photogenerated charge carriers and the generation of a photovoltage belong to the fundamental functionalities of any solar cell. These processes happen not instantaneously but rather come with finite time constants, e.g., a time constant related to the rise of the externally measured open circuit voltage following a short light pulse. Herein, a new method to analyze transient photovoltage measurements at different bias light intensities combining rise and decay times of the photovoltage. The approach uses a linearized version of a system of two coupled differential equations that are solved analytically by determining the eigenvalues of a 2 × 2 matrix. By comparison between the eigenvalues and the measured rise and decay times during a transient photovoltage measurement, the rates of carrier recombination and extraction as a function of bias voltage are determined, and establish a simple link between their ratio and the efficiency losses in the perovskite solar cell.
LB  - PUB:(DE-HGF)16
C6  - 37147880
UR  - <Go to ISI:>//WOS:001031871500001
DO  - DOI:10.1002/adma.202300872
UR  - https://juser.fz-juelich.de/record/1007373
ER  -