Efficient and Stable Perovskite/Organic Tandem Solar Cells through an All-Polymer Mixture
Yan Wang a, Zonglong Zhu a b
a Department of Chemistry, City University of Hong Kong, Hong Kong SAR, P. R. China
b Shenzhen Research Institute, City University of Hong Kong, Shenzhen, 518057 China
Poster, Yan Wang, 182
Publication date: 6th February 2024

Perovskite-based tandem solar cells have attracted a lot of attention nowadays because of their outstanding efficiency and ability to exceed Shockley-Queisser (S-Q) limits. Among these, perovskite organic tandem solar cells (POTSCs) are particularly noteworthy as promising candidates because of the high-throughput solution processibility, superior flexibility, and excellent ambient stability taking advantage of the protective effects of organic bulk-heterojunction (BHJ) on perovskites from the damage via water and oxygen.

Among all types of organic BHJs, the all-polymer mixture composed of polymeric donors and acceptors shows greater promise because of the appropriate blend film morphology and superior intermixing segregation when compared to blends based on small molecular acceptors (SMAs). Herein, a quaternary all-polymer mixture was first employed to boost the performance and stability of POTSCs according to our previous work. [1], [2], [3] The quaternary blend not only exhibits light harvest beyond 950 nm with improved charge transport dynamics but also optimizes the blend film morphology with superior intermixing segregation. The resulting POTSCs produced by the quaternary all-polymer mixture achieved a champion PCE of 24.6%, which is comparable to that of the SMA-based counterpart. More importantly, whereas the unencapsulated SMA-based POTSCs only preserved 50% of the original value, the unencapsulated all-polymer-based POTSCs show extraordinary ambient stability, retaining 80% of its initial PCE after 1000 hours of storage in air (RH: ~50%). The improved ambient stability is mainly ascribed to the superior film-forming capabilities and potent barrier effect of an all-polymer mixture to protect perovskite film from water and oxygen. These results highlight the all-polymer mixture's remarkable potential as an alternative in developing stable and effective POTSCs to overtake existing perovskite-based TSCs.

Thanks to the support of the Hong Kong PhD Fellowship Scheme for the conference and research related travel allowance. This work was supervised by Prof. Zonglong Zhu, who is supported by National Key Research and Development Program of China (No. 2023YFB3809700), Innovation and Technology Fund (GHP/100/20SZ, GHP/102/20GD, MRP/040/21X, ITS/147/22FP), Research Grants Council of Hong Kong Grant (N_CityU102/23, C4005-22Y, C1055-23G, 11306521), Green Tech Fund (GTF202020164), the Science Technology and Innovation Committee of Shenzhen Municipality (SGDX20210823104002015, JCYJ20220818101018038), National Natural Science Foundation of China (52322318).

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