TY  - JOUR
A1  - Zeiske, Stefan
A1  - Sandberg, Oskar J.
A1  - Kurpiers, Jona
A1  - Shoaee, Safa
A1  - Meredith, Paul
A1  - Armin, Ardalan
T1  - Probing charge generation efficiency in thin-film solar cells by integral-mode transient charge extraction
JF  - ACS photonics
N2  - The photogeneration of free charges in light-harvesting devices is a multistep process, which can be challenging to probe due to the complexity of contributing energetic states and the competitive character of different driving mechanisms. In this contribution, we advance a technique, integral-mode transient charge extraction (ITCE), to probe these processes in thin-film solar cells. ITCE combines capacitance measurements with the integral-mode time-of-flight method in the low intensity regime of sandwich-type thin-film devices and allows for the sensitive determination of photogenerated charge-carrier densities. We verify the theoretical framework of our method by drift-diffusion simulations and demonstrate the applicability of ITCE to organic and perovskite semiconductor-based thin-film solar cells. Furthermore, we examine the field dependence of charge generation efficiency and find our ITCE results to be in excellent agreement with those obtained via time-delayed collection field measurements conducted on the same devices.
KW  - charge generation
KW  - thin-film solar cells
KW  - organic semiconductors;
KW  - perovskite semiconductors
KW  - external generation efficiency
Y1  - 2022
U6  - https://doi.org/10.1021/acsphotonics.1c01532
SN  - 2330-4022
VL  - 9
IS  - 4
SP  - 1188
EP  - 1195
PB  - American Chemical Society
CY  - Washington
ER  -