Proceedings of 13th Conference on Hybrid and Organic Photovoltaics (HOPV21)
Publication date: 11th May 2021
A two-terminal hybrid tandem solar cell consists of two sub-cells (a high-bandgap hybrid perovskite sub-cell and a low-bandgap Si sub-cell) connected in series with each other using ITO as the recombination layer. The efficiency of a tandem solar cell depends on the performance of the individual sub-cells as well as their current matching capability. We investigate here the charge carrier dynamics in these individual sub-cells in response to a supercontinuum picosecond light pulse, where the spectral range provides the possibility to photoexcite single sub-cell as well as collectively both the sub-cells. The transient photocurrent responses were also characterized at different intensity levels of the dc-light bias. We observe a spectral dependence of transient photocurrent lifetime which can be classified into two distinct timescales. The first timescale in the range of ~ 500 ns represents the top-perovskite sub-cell (absorption range from 300 nm – 750nm) and the other timescale regime of ~ 10 - 30 µs corresponds to the bottom Si sub-cell (> 750 nm). These lifetimes observed under single sub-cell excitation are comparable to the lifetimes measured for individual single-junction cells for the respective materials. The measurements also indicate that the carrier-lifetimes in each of the sub-cells are independent when the other sub-cell is specifically excited with different intensities of steady-state illumination. The results obtained from the transient photocurrent measurements were modelled using the scattering matrix formulation for generating the carrier generation profiles and drift-diffusion equations for understanding the carrier transport process. These studies quantify the important effects of imbalance on the charge carrier dynamics.
The authors acknowledge EPSRC-UKRI Global Challenge Research Fund project, SUNRISE (Grant No. EP/P032591/1) for financial assistance. AG, PK and KSN also acknowledge the Department of Science and Technology, Government of India for funding.
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