Interfacial Engineering with Organic Hole Transport Layer for Highly Efficient Wide-Bandgap Perovskite Solar Cells

Abstract

Interfacial Engineering with Organic Hole Transport Layer for Highly Efficient Wide-Bandgap Perovskite Solar Cells Jihye Yong Department of Organic and Nano Engineering The Graduate School Hanyang University The interface of organic-inorganic hybrid perovskite solar cells (PSCs) has received significant attention in recent years for achieving high- performing and highly stable devices. In this study, we have designed new organic molecules based on quinoxaline and triphenylamine that are intended for use in inverted structure wide-bandgap PSCs, the purpose of these molecules is to enhance the interfacial properties between the perovskite and the NiOx layer. The incorporation of an organic layer that is organic reduces the energy level discrepancy between the HTL and wide- bandgap perovskite, while covering the perovskite's defects with a passivation layer. It results in an enhanced extraction of charge and a minimized amount of non-radiative recombination at the interface. Additionally, the increased surface characteristics and hydrophobicity have an effect on the quality of the perovskite film, this results in a larger grain size and higher degree of crystallinity. As a result, the efficiency of power conversion (PCE) of the PSC increased from 18.9% to 20.1% with the IQTPAFlu interlayer, the increase in voltage of the device approximately 1.3V, and 91% of the initial PCE of the device was retained. The highly stable, wide-bandgap PSCs that have a high Voc and PCEs values are promised to be good candidates for tandem solar cells.