[22p-B103-1~17] 12.5 Organic solar cells

▲ [22p-B103-7] Reduction of voltage loss and halide segregation in wide-bandgap perovskite is key to improve the performance of all perovskite tandem solar cells

〇(P)Gaurav Kapil^1,2, Takeru Bessho², Qing Shen¹, Hiroshi Segawa², Shuzi Hayase¹ (1.Uni. of Electr-Comm., 2.Uni. of Tokyo)

Keywords:Wide-bandgap perovskite, Voltage loss, All perovskite tandem solar cell

Tin-lead perovskite solar cells (TLPSCs) now could achieve the power conversion efficiencies (PCEs) more than 23%, getting closer to the PCE obtained by Pb only PSCs. According to Shockley-Queisser (SQ) limit TLPSCs are most suitable candidates for obtaining the highest possible PCE [2] for single junction solar cells. Also, TLPSCs are suitable in tandem solar cell technology [3] to further improve the PCEs obtained by utilizing solution processable perovskite thin films. Till now, PCE of 26.4% have been achieved in all perovskite tandem solar cells structures. These all perovskite tandem consists of top cell with a wide-bandgap in the range of 1.7-1.8 eV and a bottom cell with a narrow-bandgap of 1.2-1.3 eV. In this work, we concluded that high voltage-loss in wide-bandgap solar cell is the bottleneck in further improvement of tandem solar cells that need to overcome. Apart from this, halide segregation is one of the key issues that need to be solved. Therefore, in our work we highlighted these drawbacks and the strategies to overcome the issues.
References
1. G. Kapil and S. Hayase et al., ACS Energy Letters, 2022, 7, 966-974.
2. W. Shockley, H. J. Queisser, J. Appl. Phys. 1961, 32, 510.
3. R. Lin and H. Tan et al., Nature, 2022, 603, 73-78.