Functional-group-induced Single Quantum Well Dion-Jacobson 2d Perovskite for Efficient and Stable Inverted Perovskite Solar Cells.

In 2D/3D perovskite heterostructure, randomly distributed multiple quantum wells (QW) two-dimensional (2D) perovskites are frequently generated, which are detrimental to carrier transport and structural stability. Here, the high quality 2D/3D perovskite heterostructure is constructed by fabricating functional-group-induced single QW Dion-Jacobson (DJ) 2D perovskites. The utilization of -OCH 3 in the precursor solution facilitates the formation of colloidal particles with uniform size, resulting in the production of a pure 2D DJ perovskite with an n value of 3. This strategy facilitates the improvement of three-dimensional (3D) structural stability and expedites carrier transport. The resultant devices accomplish a power conversion efficiency (PCE) of 25.26% (certified 25.04%) and 23.56% at a larger area (1 cm 2 ) with negligible hysteresis. The devices maintain >96% and >89% of their initial efficiency after continuous maximum power point tracking under simulated AM1.5 illumination for 1300 h and under damp-heat conditions (85°C and 85% RH) for 1010 h, respectively. This article is protected by copyright. All rights reserved.