Sub-1.4eV bandgap inorganic perovskite solar cells with long-term stability
Sub-1.4eV bandgap inorganic perovskite solar cells with long-term stability
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DOI：
10.1038/s41467-019-13908-6
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发表时间：
2020-01-09
影响因子：
16.6
通讯作者：
Zhou, Yuanyuan
中科院分区：
文献类型：
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作者：
Hu, Mingyu;Chen, Min;Zhou, Yuanyuan
最先进的卤化物钙钛矿太阳能电池具有大于1.45eV的带隙，这限制了它们实现Shockley-Queisser极限的潜力。先前对低带隙（1.2至1.4 eV）卤化物钙钛矿的研究已经产生了几种候选物，但都是混合有机-无机组合物，引起了对器件稳定性的潜在担忧。在这里，我们展示了通过界面功能化稳定的无机低带隙（1.38 eV）CsPb0.6Sn0.4I3钙钛矿的前景。器件效率高达13.37%。该装置在一个太阳强度的光照下显示出高的操作稳定性，T-80和T-70寿命分别为653 h和1045 h（T-80和T-70分别表示效率衰减至初始值的80%和70%），以及在氮气气氛下的长期货架稳定性。在长期（1000 h）测试期间，器械受控暴露于环境大气不会降低效率。这些发现为实现具有高稳定性的低带隙钙钛矿太阳能电池指明了一个有希望的方向。
State-of-the-art halide perovskite solar cells have bandgaps larger than 1.45eV, which restricts their potential for realizing the Shockley-Queisser limit. Previous search for low-bandgap (1.2 to 1.4 eV) halide perovskites has resulted in several candidates, but all are hybrid organic-inorganic compositions, raising potential concern regarding device stability. Here we show the promise of an inorganic low-bandgap (1.38 eV) CsPb0.6Sn0.4I3 perovskite stabilized via interface functionalization. Device efficiency up to 13.37% is demonstrated. The device shows high operational stability under one-sun-intensity illumination, with T-80 and T-70 lifetimes of 653h and 1045 h, respectively (T-80 and T-70 represent efficiency decays to 80% and 70% of the initial value, respectively), and long-term shelf stability under nitrogen atmosphere. Controlled exposure of the device to ambient atmosphere during a long-term (1000 h) test does not degrade the efficiency. These findings point to a promising direction for achieving low-bandgap perovskite solar cells with high stability.