Extrinsic Ion Distribution Induced Field Effect in CsPbIBr2 Perovskite Solar Cells.,Small

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Extrinsic Ion Distribution Induced Field Effect in CsPbIBr2 Perovskite Solar Cells.
Small ( IF 13.0 ) Pub Date : 2020-04-06 , DOI: 10.1002/smll.201907283
Yulong Wang ₁ , Kai Wang ₂ , Waqas Siddique Subhani _{2,

3} , Congqiang Zhang ₁ , Xiao Jiang ₂ , Shimin Wang ₁ , Huaxi Bao ₁ , Lu Liu ₂ , Li Wan ₁ , Shengzhong Frank Liu _{2,

4}

Affiliation

Excellent power conversion efficiency (PCE) and stability are the primary forces that propel the all-inorganic cesium-based halide perovskite solar cells (PSCs) toward commercialization. However, the intrinsic high density of trap state and internal nonradiative recombination of CsPbIBr2 perovskite film are the barriers that limit its development. In the present study, a facile additive strategy is introduced to fabricate highly efficient CsPbIBr2 PSCs by incorporating sulfamic acid sodium salt (SAS) into the perovskite layer. The additive can control the crystallization behaviors and optimize morphology, as well as effectively passivate defects in the bulk perovskite film, thereby resulting in a high-quality perovskite. In addition, SAS in perovskite has possibly introduced an additional internal electric field effect that favors electron transport and injection due to inhomogeneous ion distribution. A champion PCE of 10.57% (steady-output efficiency is 9.99%) is achieved under 1 Sun illumination, which surpasses that of the contrast sample by 16.84%. The modified perovskite film also exhibits improved moisture stability. The unencapsulated device maintains over 80% initial PCE after aging for 198 h in air. The results provide a suitable additive for inorganic perovskite and introduce a new conjecture to explain the function of additives in PSCs more rationally.

中文翻译：

CsPbIBr2钙钛矿太阳能电池中的非本征离子分布诱导的场效应。

出色的功率转换效率（PCE）和稳定性是推动全无机铯基卤化物钙钛矿太阳能电池（PSC）走向商业化的主要力量。但是，CsPbIBr2钙钛矿薄膜固有的高陷阱能级密度和内部非辐射复合是限制其发展的障碍。在本研究中，引入了一种简便的添加策略，即通过将氨基磺酸钠盐（SAS）掺入钙钛矿层中来制造高效CsPbIBr2 PSC。该添加剂可以控制结晶行为并优化形貌，并有效钝化整体钙钛矿薄膜中的缺陷，从而得到高质量的钙钛矿。此外，钙钛矿中的SAS可能引入了额外的内部电场效应，由于离子分布不均匀，有利于电子传输和注入。在1个阳光照射下，PCE的最佳PCE为10.57％（稳定输出效率为9.99％），比对比样品的PCE高16.84％。改性钙钛矿膜还表现出改善的湿稳定性。在空气中老化198小时后，未封装的设备可保持80％以上的初始PCE。结果为无机钙钛矿提供了合适的添加剂，并提出了新的猜想，以更合理地解释添加剂在PSC中的作用。改性钙钛矿膜还表现出改善的湿稳定性。在空气中老化198小时后，未封装的设备可保持80％以上的初始PCE。结果为无机钙钛矿提供了合适的添加剂，并提出了新的猜想，以更合理地解释添加剂在PSC中的作用。改性钙钛矿膜还表现出改善的湿稳定性。在空气中老化198小时后，未封装的设备可保持80％以上的初始PCE。结果为无机钙钛矿提供了合适的添加剂，并提出了新的猜想，以更合理地解释添加剂在PSC中的作用。

更新日期：2020-04-06

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