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Oxidization-Free Spiro-OMeTAD Hole-Transporting Layer for Efficient CsPbI2Br Perovskite Solar Cells
ACS Applied Materials & Interfaces ( IF 8.3 ) Pub Date : 2020-11-10 , DOI: 10.1021/acsami.0c16355 Zhu Ma 1 , Zheng Xiao 1 , Qianyu Liu 1 , Dejun Huang 1 , Weiya Zhou 1 , Huifeng Jiang 2 , Zhiqing Yang 2 , Meng Zhang 1 , Wenfeng Zhang 1 , Yuelong Huang 1
ACS Applied Materials & Interfaces ( IF 8.3 ) Pub Date : 2020-11-10 , DOI: 10.1021/acsami.0c16355 Zhu Ma 1 , Zheng Xiao 1 , Qianyu Liu 1 , Dejun Huang 1 , Weiya Zhou 1 , Huifeng Jiang 2 , Zhiqing Yang 2 , Meng Zhang 1 , Wenfeng Zhang 1 , Yuelong Huang 1
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The inorganic CsPbI2Br perovskite faces serious challenges of low phase stability and high moisture sensitivity. The moisture controllable process of a hole-transporting layer (HTL) is crucial for the development of stable and efficient inorganic perovskite solar cells (IPSCs). In this work, we proposed an oxidization-free spiro-OMeTAD hole-transport layer (HTL) with a preoxidized spiro-OMeTAD solution to prevent moisture and completely avoid the phase transition of CsPbI2Br from the α-phase to β-phase. The oxidization-free HTL exhibited improved surface hydrophobic properties, smoother morphology, and optimized energy-level alignment compared with a traditional HTL. As a result, the CsPbI2Br-based IPSCs achieved an efficiency of up to 14.2 and 86.6% of the initial power conversion efficiency (PCE) with 2000 h storage. Meanwhile, this oxidization-free HTL was applied in CH3NH3PbI3-based PSCs and obtained 13.8% PCE enhancement, which proved the universality of the solution preoxidization tactic. We believe that the oxidization-free HTL could be an efficient strategy to replace traditional HTLs and can be widely used in perovskite solar cells, especially in moisture-sensitive PSCs.
中文翻译：
高效CsPbI 2 Br钙钛矿太阳能电池的无氧化Spiro-OMeTAD空穴传输层
无机CsPbI 2 Br钙钛矿面临着低相稳定性和高湿度敏感性的严峻挑战。空穴传输层（HTL）的湿度可控过程对于开发稳定高效的无机钙钛矿太阳能电池（IPSC）至关重要。在这项工作中，我们提出了一种具有预氧化螺-OMeTAD溶液的无氧化螺-OMeTAD空穴传输层（HTL），以防止水分并完全避免CsPbI 2 Br从α相转变为β相。与传统的HTL相比，无氧化的HTL具有改善的表面疏水性，更平滑的形态和优化的能级排列。结果，CsPbI 2基于Br的IPSC在存储2000 h时可实现高达14.2的效率和初始功率转换效率（PCE）的86.6％。同时，将该无氧化的HTL应用于CH 3 NH 3 PbI 3基的PSC中，并获得了13.8％的PCE增强，证明了溶液预氧化策略的普遍性。我们认为，无氧化的HTL可能是替代传统HTL的有效策略，可以广泛用于钙钛矿太阳能电池，尤其是对湿气敏感的PSC。
更新日期：2020-11-25
中文翻译：
高效CsPbI 2 Br钙钛矿太阳能电池的无氧化Spiro-OMeTAD空穴传输层
无机CsPbI 2 Br钙钛矿面临着低相稳定性和高湿度敏感性的严峻挑战。空穴传输层（HTL）的湿度可控过程对于开发稳定高效的无机钙钛矿太阳能电池（IPSC）至关重要。在这项工作中，我们提出了一种具有预氧化螺-OMeTAD溶液的无氧化螺-OMeTAD空穴传输层（HTL），以防止水分并完全避免CsPbI 2 Br从α相转变为β相。与传统的HTL相比，无氧化的HTL具有改善的表面疏水性，更平滑的形态和优化的能级排列。结果，CsPbI 2基于Br的IPSC在存储2000 h时可实现高达14.2的效率和初始功率转换效率（PCE）的86.6％。同时，将该无氧化的HTL应用于CH 3 NH 3 PbI 3基的PSC中，并获得了13.8％的PCE增强，证明了溶液预氧化策略的普遍性。我们认为，无氧化的HTL可能是替代传统HTL的有效策略，可以广泛用于钙钛矿太阳能电池，尤其是对湿气敏感的PSC。
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