# Self-assembled bilayer for perovskite solar cells with improved tolerance against thermal stresses

“Self-assembled bilayer for perovskite solar cells with improved tolerance against thermal stresses” (2025), by Bitao Dong et al. Engineering research paper. Original abstract below, unchanged. A free PDF is available.

- Authors: Bitao Dong, Mingyang Wei, Yuheng Li, Yingguo Yang, Wei Ma, Yueshuai Zhang, Yanbiao Ran, Meijie Cui, Ziru Su, Qunping Fan et al.
- Published: January 6, 2025
- Field: Engineering
- DOI: https://doi.org/10.1038/s41560-024-01689-2
- Free PDF: https://www.nature.com/articles/s41560-024-01689-2.pdf

## Abstract

The adoption of perovskite solar cells (PSCs) requires improved resistance to high temperatures and temperature variations. Hole-selective self-assembled monolayers (SAMs) have enabled progress in the performance of inverted PSCs, yet they may compromise temperature stability owing to desorption and weak interfacial contact. Here we developed a self-assembled bilayer by covalently interconnecting a phosphonic acid SAM with a triphenylamine upper layer. This polymerized network, formed through Friedel–Crafts alkylation, resisted thermal degradation up to 100 °C for 200 h. Meanwhile, the face-on-oriented upper layer exhibited adhesive contact with perovskites, leading to a 1.7-fold improvement in adhesion energy compared with the SAM–perovskite interface. We reported power conversion efficiencies exceeding 26% for inverted PSCs. The champion devices demonstrated less than 4% and 3% efficiency loss after 2,000 h damp heat exposure (85 °C and 85% relative humidity) and over 1,200 thermal cycles between −40 °C and 85 °C, respectively, meeting the temperature stability criteria outlined in the International Electrotechnical Commission 61215:2021 standards. To improve the tolerance of perovskite solar cells against high temperatures and temperature variations, Dong et al. covalently cross-link two molecules in the charge transport layer to strengthen adhesion with the perovskite layer.

Canonical page: https://nerdi.pages.dev/paper/W4406104388
Read three real papers a day in Nerdi (iPhone): https://apps.apple.com/app/apple-store/id6813826387?pt=128757794&ct=web-paper&mt=8