Margaryan Igor V, Vedernikova Anna A, Borodina Lyubov' N, Kuzmenko Natalya K, Koroleva Aleksandra V, Zhizhin Evgeniy V, Zhang Xiaoyu, Ushakova Elena V, Litvin Aleksandr P, Zheng Weitao
PhysNano Department, ITMO University, Saint Petersburg 197101, Russia.
Research Center for Optical Materials Science, ITMO University, Saint Petersburg 197101, Russia.
Nanotechnology. 2024 Aug 9;35(43). doi: 10.1088/1361-6528/ad6870.
Solution-processed perovskite solar cells (PSCs) have demonstrated a tremendous growth in power conversion efficiency (PCE). A high-quality, defect-free perovskite-based active layer is a key point to enhance PSC performance. Introduction of additives and interlayers have proved to be an effective tool to passivate surface defects, control crystal growth, and improve PSC stability. Antisolvent engineering has emerged recently as a new approach, which aims to adjust perovskite layer properties and enhance the PCE and stability of PSC devices. Here, we demonstrate that carbon dots (CDs) may serve as a prospective additive for antisolvent engineering. Nitrogen-rich amphiphilic CDs were synthesized from amines by a solvothermal method and used as an additive to chlorobenzene for a perovskite layer fabrication. The interaction between perovskite and functional groups in CDs promotes improved crystallization of an active perovskite layer and defects passivation, bringing higher PSCs efficiency, stability, and suppressed hysteresis. Under optimized CD concentration, the maximum PCE increased by 34% due to the improved short-circuit current and fill factor, and the device maintains 87% of its initial efficiency after 6 d of storage under ambient conditions.
溶液法制备的钙钛矿太阳能电池（PSC）在功率转换效率（PCE）方面取得了巨大的增长。高质量、无缺陷的钙钛矿基活性层是提高PSC性能的关键。引入添加剂和中间层已被证明是一种钝化表面缺陷、控制晶体生长和提高PSC稳定性的有效方法。反溶剂工程最近作为一种新方法出现，旨在调整钙钛矿层性能并提高PSC器件的PCE和稳定性。在此，我们证明碳点（CD）可作为反溶剂工程的一种潜在添加剂。通过溶剂热法由胺合成了富氮两亲性CD，并将其用作氯苯的添加剂用于制备钙钛矿层。钙钛矿与CD中官能团之间的相互作用促进了活性钙钛矿层结晶的改善和缺陷钝化，从而带来更高的PSC效率、稳定性并抑制滞后现象。在优化的CD浓度下，由于短路电流和填充因子的提高，最大PCE提高了34%，并且该器件在环境条件下储存6天后仍保持其初始效率的87%。
