Abstract：
Quasi-2D perovskites show great potential as photovoltaic devices with superior stability, but the power conversion efficiency (PCE) is limited by poor carrier transport. Here, it is simultaneously affected the hole transport layer (HTL) and the perovskite layer by incorporating pyridine-based materials into poly(3,4-ethylenedioxythiophene): polystyrene sulfonate (PEDOT:PSS) to address the key problem above in 2D perovskites. With this approach, the enhanced optoelectronic performance of the novel PEDOT:PSS is due to electron transfer between the additives and PEDOT or PSS, as well as a dissociation between PEDOT and PSS based on experimental and theoretical studies, which facilitates the charge extraction and transfer. Concurrently, in-situ X-ray scattering studies reveal that the introduction of pyridine-based molecules alters the transformation process of the perovskite intermediate phase, which leads to a preferred orientation and ordered distribution caused by the Pb─N chemical bridge, achieving efficient charge transport. As a result, the pyridine-treated devices achieve an increased short-circuit current density (Jsc) and PCE of over 17%.
摘要：
准2D钙钛矿作为光伏器件显示出巨大的潜力，具有优越的稳定性，但是功率转换效率(PCE)受限于较差的载波传输。这里,通过将吡啶基材料掺入聚(3,4-亚乙基二氧噻吩):聚苯乙烯磺酸盐(PEDOT:PSS)中同时影响空穴传输层(HTL)和钙钛矿层,以解决上述2D钙钛矿中的关键问题。通过这种方法，新型PEDOT：PSS的增强的光电性能是由于添加剂与PEDOT或PSS之间的电子转移，以及基于实验和理论研究的PEDOT和PSS之间的分离，这有利于电荷提取和转移。同时,原位X射线散射研究表明，吡啶基分子的引入改变了钙钛矿中间相的转化过程，导致Pb─N化学桥引起的择优取向和有序分布，实现高效的电荷传输。因此,吡啶处理的器件实现了超过17%的增加的短路电流密度(Jsc)和PCE。
