Chen Liang, Liu Zhipeng, Qiu Linlin, Xiong Jie, Song Lixin, Du Pingfan
College of Textile Science and Engineering, Zhejiang Sci-Tech University, Hangzhou 310018, People's Republic of China.
College of Textile and Garment, Quanzhou Normal University, Quanzhou 362000, People's Republic of China.
ACS Nano. 2023 Dec 12;17(23):23794-23804. doi: 10.1021/acsnano.3c07784. Epub 2023 Nov 27.
Tin oxide (SnO) is widely used as an inorganic electron transport layer (ETL) for rigid and flexible perovskite solar cells (PSCs). In this work, an extract of snail shell, the sodium salt of polyaspartic acid (S-PASP), a water-soluble polypeptide polymer, has been used to multifunctionally regulate SnO nanograins. S-PASP has a strong chelating and dispersing effect; thus, chemically adsorbed SnO can inhibit agglomeration. The S-PASP:SnO ETL also improved the extraction and transferability of carriers, reducing body defects and interfacial charge. Moreover, the S-PASP:SnO ETL promotes the vertical growth of the perovskite crystals due to its bottom-up morphology, wettability, and strain release, which is conducive to improving the photoelectric performance of the device. The optimized rigid device prepared under open-air conditions obtained a PCE of 20.92%. In addition, due to the stress compensation of the S-PASP long chain, which prevented the cracking and displacement of the ETL, the optimal PCE of the flexible device was 17.96%, and the initial efficiency was maintained at 82.8% after 100 bends. This work introduces a molecular doping mechanism for organic-inorganic hybrid electronics.
氧化锡（SnO）被广泛用作刚性和柔性钙钛矿太阳能电池（PSC）的无机电子传输层（ETL）。在这项工作中，蜗牛壳提取物，聚天冬氨酸钠盐（S-PASP），一种水溶性多肽聚合物，已被用于多功能调节SnO纳米颗粒。S-PASP具有很强的螯合和分散作用；因此，化学吸附的SnO可以抑制团聚。S-PASP:SnO ETL还提高了载流子的提取和转移能力，减少了体缺陷和界面电荷。此外，S-PASP:SnO ETL由于其自下而上的形态、润湿性和应变释放，促进了钙钛矿晶体的垂直生长，这有利于提高器件的光电性能。在露天条件下制备的优化刚性器件的光电转换效率（PCE）达到20.92%。此外，由于S-PASP长链的应力补偿，防止了ETL的开裂和位移，柔性器件的最佳PCE为17.96%，在100次弯曲后初始效率保持在82.8%。这项工作引入了一种有机-无机混合电子学的分子掺杂机制。
