Highly Stable Perovskite Solar Cells with Protective Layers Obtained via Interfacial Modification

Abstract

Currently, achieving both high efficiency and long‐term stability is crucial for the successful application of perovskite solar cells (PSCs). Grain boundary defects significantly impact the stability of PSCs, and passivating these grain boundaries (GBs) remains a major challenge. In this study, the surfactant dodecyltrimethylammonium chloride (DTAC) was dissolved in low‐polarity chlorobenzene (CB) at 58 °C to modify the interface of MAPbI3 film, and DTAC reacted with MAPbI3 film surface to generate a protective layer that could be covered on the perovskite grains, effectively reducing the expose GBs. Additionally, the hydrophobic alkyl chains of DTA+ and the strong chemical bond between the Cl‐ and Pb2+ ions further enhanced the resistance of the perovskite surface layer to heat, moisture, and oxidation. Due to the passivation of iodine vacancy defects, the photo‐stability of unencapsulated DTAC devices is significantly improved. By passivating surface and GBs defects of the MAPbI3 perovskite crystals, the power conversion efficiency (PCE) of the low‐temperature carbon‐based PSCs treated by DTAC is 15.03% compared to 13.97% for the control device. This study offers another referable strategy for enhancing the thermal, moisture, light, and oxygen stability of perovskite materials while considering the photovoltaic performance of devices.This article is protected by copyright. All rights reserved.

Halide Perovskites Multifunctional Property: Coordination Engineering, Coordination Chemistry, Electronic Interactions and Energy Applications beyond Photovoltaic

“…[255] Besides, MASnI3-xBrx based perovskite tandem solar cell with power conversion efficiency of 30.7% is reported, overcoming the toxicity problem of perovskite solar cells. [256] Many works also reported the path towards enhanced stability for commercialization by using strategies such as encapsulation,[257-262] chemical replacement approach [262][263][264][265] and protective layers [266][267][268][269][270][271][272] such as molybdenum oxide, vanadium oxide to protect exposure from oxygen, moisture, high temperature and sunlight exposure, [273] fabrication of perovskite tandem solar module [274][275][276][277][278][279][280][281] while others stated scalability of module efficiency, achieving durability and stability, and process control, yield, etc. of manufacturing are vital for practical validations.…”