Work

Gradient layer arrangement for modulating the buried interface of inverted perovskite solar cells

Year: 2025

Type: article

Abstract: The surface modification of transparent conductive oxides with self-assembled monolayers (SAM) based on carbazole has been demonstrated to be a workable strategy for the formation of efficient hole-selective contacts, thus significantly enhancing the power conversion efficiency (PCE) and stability of p-i-n perovskite solar cells (PSCs). While the inherent monolayer nature of SAM offers unique advantages, the buried interface poses a significant challenge to synergistic regulation for both perovskite (PVK) and SAM. In this study, an interfacial layer composed of an ionic compound, 3-(methylthio) propylamine hydroiodide (3MTPAI), is introduced between the PVK and SAM layers to enhance the photovoltaic performance of PSCs . 3MTPAI has been demonstrated to enhance the ion–dipole interactions of the SAM, facilitating a better-matched energy level between the PVK and hole transport layer (HTL). This, in turn, improves hole extraction/transport from the PVK layer to the HTL and reduces carrier recombination of the PSCs . Consequently, the PCE of the PSCs modified with 3MTPAI increases from 23.90 % to 25.30 %. Furthermore, devices treated with 3MTPAI exhibit enhanced stability, maintaining 90 % of the original PCE after 1000 h under conditions of 55 ± 5 % RH. Therefore, the buried interface modification strategy employing dual-role 3MTPAI molecules emerges as a viable approach to enhance the efficiency and stability of PSCs .

Source: Chemical Engineering Journal

DOI: 10.1016/j.cej.2025.162942