Charge Extraction and Recombination Dynamics of CdSe/CdTe Solar Cells Studied with Transient Photovoltage/Photocurrent Techniques
Significant advancements have been made in the development of high-performance cadmium telluride (CdTe)-based thin film solar cells. However, studies examining the transient excited-state charge dynamics, which determine the final steady-state device performance, are relatively scarce, particularly under device operando conditions. In this work, we investigated charge recombination and extraction dynamics of CdTe solar cells, in comparison with MAPbI3 and narrow bandgap perovskitebased solar cells, using bias-light intensity-dependent transient photovoltage (TPV) and transient photocurrent (TPC) techniques. We found that trap-assisted recombination is the dominant mechanism in the CdTe device at open-circuit, even at 1 sun illumination. Parameters such as charge density, carrier lifetime, and recombination order were extracted from the TPV/TPC data and successfully used to reproduce the open-circuit voltage and short-circuit current densities of the devices measured at steadystate. Consequently, we conclude that these techniques are effective for characterizing charge recombination and extraction dynamics of CdTe solar cells under operando conditions.
WOS:001151676200047
2023-01-01
978-1-6654-6059-0
New York
REVIEWED
Event name | Event place | Event date |
San Juan, PR | JUN 11-16, 2023 | |
Funder | Grant Number |
Air Force Research Laboratory | FA9453-19C-1002 |
U.S. DOE's Office of Energy Efficiency and Renewable Energy (EERE) under the Solar Energy Technologies Office (SETO) | DEEE0008974 |
U.S. Department of Energy | 37989 |