华南理工大学严克友团队报道了耐用的全无机钙钛矿串联光伏器件。相关研究成果于2024年11月28日发表于国际一流学术期刊《自然》。

通过用无机阳离子（如Cs⁺）替代有机阳离子（如甲基铵（MA⁺）和甲脒（FA⁺）），制备的所有无机钙钛矿，都是提高钙钛矿太阳能电池（PSCs）长期光稳定性和热稳定性的有效概念。

因此，无机钙钛矿叠层太阳能电池（IPTSCs）是打破效率瓶颈，和解决稳定性问题的有前景的候选者。然而，由于锡阳离子引起的较差的成膜和深陷阱态，在制造2端（2T）IPTSCs方面仍然存在挑战。

该文中，研究人员采用对甲苯磺酰肼（PTSH）的配体进化（LE）策略，来调节薄膜形成并消除无机窄带隙（NBG）钙钛矿中的深陷阱，从而成功开发了2T IPTSCs。因此，1.31eV CsPb_0.4Sn_0.6I₃:LE器件提供了17.41%的创纪录效率。

结合1.92eV CsPbI₂Br顶部电池，2T IPTSCs的冠军效率为22.57%（认证为21.92%）。此外，IPTSCs的设计可在最大功率点（MPP）跟踪下提供卓越的耐用性，分别在65°C下保持80%的初始效率1510小时和85°C下维持800小时。

研究结果阐明了LE利用无机NBG钙钛矿生长的多种作用，该研究为开发高效稳定的IPTSCs提供了有见地的指导。

附：英文原文

Title: Durable all inorganic perovskite tandem photovoltaics

Author: Duan, Chenghao, Zhang, Kaicheng, Peng, Zijian, Li, Shiang, Zou, Feilin, Wang, Feng, Li, Jiong, Zhang, Zheng, Chen, Chang, Zhu, Qiliang, Qiu, Jianhang, Lu, Xinhui, Li, Ning, Ding, Liming, Brabec, Christoph J., Gao, Feng, Yan, Keyou

Issue&Volume: 2024-11-28

Abstract: All-inorganic perovskites prepared by substituting the organic cations (e.g. methylammonium (MA+) and formamidinium (FA+)) with inorganic cations (e.g. Cs+) are effective concepts to enhance the long-term photo- and thermal-stability of perovskite solar cells (PSCs)1,2. Hence, inorganic perovskite tandem solar cells (IPTSCs) are promising candidates for breaking the efficiency bottleneck and addressing the stability issue as well3,4. However, challenges remain in fabricating 2-terminal (2T) IPTSCs due to the inferior film formation and deep trap states induced by tin cations5-7. Herein, a ligand evolution (LE) strategy with p-toluenesulfonyl hydrazide (PTSH) is employed to regulate film formation and eliminate deep traps in inorganic narrow bandgap (NBG) perovskite, enabling the successful development of 2T IPTSCs. Accordingly, the 1.31 eV CsPb0.4Sn0.6I3:LE device delivers a record efficiency of 17.41%. Combined with the 1.92 eV CsPbI2Br top-cell, 2T IPTSCs exhibit a champion efficiency of 22.57% (certified 21.92%). Additionally, IPTSCs are engineered to deliver remarkable durability under maximum power point (MPP) tracking, maintaining 80% of the initial efficiency at 65 °C for 1510 h and at 85°C for 800 h, respectively. We elucidate that LE deliberately leverages multiple roles for inorganic NBG perovskite growth and anticipate our study provides insightful guideline for developing high-efficiency and stable IPTSCs.

DOI: 10.1038/s41586-024-08432-7

Source: https://www.nature.com/articles/s41586-024-08432-7