Interface-Modification-Induced Gradient Energy Band for Highly Efficient CsPbIBr2 Perovskite Solar Cells
Interface-Modification-Induced Gradient Energy Band for Highly Efficient CsPbIBr2 Perovskite Solar Cells
复制标题
高效 CsPbIBr 2 钙钛矿太阳能电池的界面-改性-诱导梯度能带
DOI：
10.1002/aenm.201803785
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发表时间：
2019-06-05
影响因子：
27.8
通讯作者：
Liu, Shengzhong (Frank)
中科院分区：
文献类型：
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作者：
Subhani, Waqas Siddique;Wang, Kai;Liu, Shengzhong (Frank)
无机铯铅卤化物钙钛矿太阳能电池（PSCs）由于其优异的稳定性而受到了极大的关注。然而，缺乏优化策略导致无机PSC遭受由显著重组引起的低效率。为了克服这种困境，通过使用SmBr 3对电子传输层（ETL）/钙钛矿界面进行表面改性，以改善钙钛矿层的结晶和形态，从而增强ETL/钙钛矿界面相互作用。令人鼓舞的是，在界面处产生了具有突出空穴阻挡效应的梯度能带。结果，在界面处发生的电荷复合和钙钛矿内部的非辐射复合都被抑制，并且同时，成功地改善了电荷提取。因此，CsPbIBr 2 PSC的功率转换效率在一个太阳照射下提高到高达10.88%，这比未经改性的同类产品高30%。从逻辑上推断，这种有价值的优化策略可以扩展到其他类似的结构和材料。
Inorganic cesium lead halide perovskite solar cells (PSCs) have received enormous attention due to their excellent stability compared with that of their organic-inorganic counterparts. However, the lack of optimization strategies leads the inorganic PSCs to suffer from low efficiency arising from significant recombination. To overcome this dilemma, a surface modification of the electron transport layer (ETL)/perovskite interface is undertaken by using SmBr3 to improve the crystallization and morphology of the perovskite layer for enhanced ETL/perovskite interface interaction. Encouragingly, a gradient energy band is created at the interface with an outstanding hole blocking effect. As a result, both the charge recombination occurring at the interface and the nonradiative recombination inside the perovskite are suppressed, and, simultaneously, the charge extraction is improved successfully. Therefore, the power conversion efficiency of the CsPbIBr2 PSCs is increased to as high as 10.88% under one sun illumination, which is 30% higher than its counterparts without the modification. It is logically inferred that this valuable optimization strategy can be extended to other analogous structures and materials.