控制准二维钙钛矿太阳能电池的结晶：结合大体积共轭配体,Advanced Energy Materials

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控制准二维钙钛矿太阳能电池的结晶：结合大体积共轭配体
Advanced Energy Materials ( IF 24.4 ) Pub Date : 2022-08-03 , DOI: 10.1002/aenm.202201501
Aidan H. Coffey ₁ , Seok Joo Yang ₁ , Martín Gómez ₁ , Blake P. Finkenauer ₁ , Tanguy Terlier ₂ , Chenhui Zhu ₃ , Letian Dou _{1,

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Affiliation

与 3D 钙钛矿相比，准 2D 杂化卤化物钙钛矿由于其更高的稳定性和更容易的可调性而引起了广泛关注。迄今为止，由于将大配体整合到薄膜器件中的困难，可能性的扩展受到限制。在这里，大体积的双噻吩 2T 配体专注于开发一种溶剂系统，围绕创建强垂直排列的 (2T) ₂ (MA) ₆ Pb ₇ I ₂₂ ( n = 7) 准二维钙钛矿薄膜。通过从配位性差的溶剂（γ-丁内酯）开始，加入少量二甲亚砜和甲醇，发现垂直取向和z-均匀性大大提高。使用掠入射广角 X 射线散射分析和先进的光学特性对这些进行仔细检查和验证。^{这些薄膜被集成到冠军太阳能电池中，实现了13.3%的功率转换效率、18.9 mA cm -2}的短路电流密度、0.96 V的开路电压和73.8%的填充因子。此外，准二维吸收层在水分中表现出优异的稳定性，数百小时后仍保持不变。此外，还将 2T 与该溶剂系统中更常见的配体丁基铵和苯乙基铵进行比较，以开发启发法并更深入地了解如何将大型配体合并到稳定的光伏器件中。

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Controlling Crystallization of Quasi-2D Perovskite Solar Cells: Incorporating Bulky Conjugated Ligands

Quasi-2D hybrid halide perovskites have drawn considerable attention due to their improved stability and facile tunability compared to 3D perovskites. The expansiveness of possibilities has thus far been limited by the difficulty in incorporating large ligands into thin-film devices. Here, a bulky bi-thiophene 2T ligand is focused on to develop a solvent system around creating strongly vertically-aligned (2T)₂(MA)₆Pb₇I₂₂ (n = 7) quasi-2D perovskite films. By starting with a poorly coordinating solvent (gamma-butyrolactone) and adding a small amount of dimethylsulfoxide and methanol, it is found that vertical orientation and z-uniformity is greatly improved. These are carefully examined and verified using grazing-incidence wide-angle X-ray scattering analysis and advanced optical characterizations. These films are incorporated into champion solar cells that achieve a power conversion efficiency of 13.3%, with a short-circuit current density of 18.9 mA cm^-2, an open-circuit voltage of 0.96 V, and a fill factor of 73.8%. Furthermore, the quasi-2D absorbing layers show excellent stability in moisture, remaining unchanged after hundreds of hours. In addition, 2T is compared with the more common ligands butylammonium and phenylethylammonium in this solvent system to develop heuristics and deeper understanding of how to incorporate large ligands into stable photovoltaic devices.

更新日期：2022-08-03

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