Li Tianpeng, Li Bin, Yang Yingguo, Jin Zuoming, Zhang Zhiguo, Wang Peilin, Deng Liangliang, Zhan Yiqiang, Zhang Qinghong, Liang Jia
Department of Materials Science and State Key Laboratory of Photovoltaic Science and Technology, Fudan University, 220 Handan Road, Shanghai, 200433, China.
State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, College of Materials Science and Engineering, Donghua University, Shanghai, 201620, China.
Nat Commun. 2024 Nov 1;15(1):9435. doi: 10.1038/s41467-024-53713-4.
Tin-based perovskite solar cells have garnered attention for their biocompatibility, narrow bandgap, and long thermal carrier lifetime. However, nip-type tin-based perovskite solar cells have underperformed largely due to the indiscriminate use of metal oxide electron transport layers originally designed for nip-type lead-based perovskite solar cells. Here, we reveal that this underperformance is caused by oxygen vacancies and deeper energy levels in metal oxide. To address these issues, we propose a metal chalcogenide electron transport layer, specifically Sn(SSe), which circumvents the oxygen molecules desorption and impedes the Sn oxidation. As a result, tin-based perovskite solar cells with Sn(SSe) demonstrate a V increase from 0.48 - 0.73 V and a power conversion efficiency boost from 6.98 - 11.78%. Additionally, these cells exhibit improved stability, retaining over 95% of their initial efficiency after 1632 h. Our findings showcase metal chalcogenides as promising candidates for future nip-type tin-based perovskite solar cell applications.
锡基钙钛矿太阳能电池因其生物相容性、窄带隙和长热载流子寿命而备受关注。然而，由于不加区分地使用最初为n-i-p型铅基钙钛矿太阳能电池设计的金属氧化物电子传输层，n-i-p型锡基钙钛矿太阳能电池的性能在很大程度上表现不佳。在此，我们揭示这种性能不佳是由金属氧化物中的氧空位和更深的能级引起的。为了解决这些问题，我们提出了一种金属硫族化物电子传输层，特别是Sn(SSe)，它可以避免氧分子解吸并阻止Sn氧化。结果，具有Sn(SSe)的锡基钙钛矿太阳能电池的电压从0.48 - 0.73 V增加，功率转换效率从6.98 - 11.78%提高。此外，这些电池表现出更好的稳定性，在1632小时后仍保持其初始效率的95%以上。我们的研究结果表明金属硫族化物是未来n-i-p型锡基钙钛矿太阳能电池应用的有前途的候选材料。
