Triple Cross‐Linking Engineering Strategies for Efficient and Stable Inverted Flexible Perovskite Solar Cells

Inverted flexible perovskite solar cells (fPSCs) are promising for commercialization due to their low cost, lightweight, and excellent stability. However, enhancing fPSCs’ power conversion efficiency and stability remains challenging. Here, an unprecedented triple cross‐linking engineering strategy...

Full description

Saved in:
Bibliographic Details
Published in:Small (Weinheim an der Bergstrasse, Germany) Germany), 2024-07, Vol.20 (29), p.e2310868-n/a
Main Authors: Tu, Silong, Gang, Yong, Lin, Yuanqiong, Liu, Xinyue, Zhong, Yi, Yu, Daquan, Li, Xin
Format: Article
Language:English
Subjects:
Commercialization
Crystallization
defect passivation
Energy conversion efficiency
flexible perovskite solar cells
Grain boundaries
Low temperature
Perovskites
Photovoltaic cells
Solar cells
Stability
strain
triple cross‐linking engineering strategy
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:Inverted flexible perovskite solar cells (fPSCs) are promising for commercialization due to their low cost, lightweight, and excellent stability. However, enhancing fPSCs’ power conversion efficiency and stability remains challenging. Here, an unprecedented triple cross‐linking engineering strategy is innovatively exhibit for efficient and stable inverted fPSCs. First, a carefully designed cross‐linker, 4‐fluorophenyl 5‐(1,2‐dithiolan‐3‐yl) pentanoate (FB‐TA), is added to the perovskite precursor solution. During the perovskite film's crystallization at a low temperature, the cross‐linking product of FB‐TA can passivate the grain boundaries and reduce the film's residual strain and Young's module. Then, FB‐TA is also introduced for the bottom‐ and top‐interface modification of the perovskite film. The interfacial treating strategy protects the perovskite from water invasion and strengthens the interfaces. The combination of triple strategies affords highly efficient inverted fPSCs with a champion efficiency of 21.42% among the state‐of‐the‐art inverted fPSCs based on nickel oxides. More importantly, the flexible devices also exhibit superior stabilities with T90 >4000 bending cycles, photostability with T90 >568 h, and ambient stability with T90 >2000 h, especially the stability with T80 >1120 h under harsh damp‐heat conditions (i.e., 85 °C and 85% RH). The strategy provides new insights into the industrialization of high‐performance and stable fPSCs. An unprecedented triple cross‐linking engineering strategy is proposed by introducing cross‐linkable 4‐fluorophenyl 5‐(1,2‐dithiolan‐3‐yl) pentanoate into the bottom, bulk, and top interface of the perovskite film to form steric passivation, enabling flexible perovskite solar cells with excellent PCE and superior overall stability.
ISSN:1613-6810
1613-6829
1613-6829
DOI:10.1002/smll.202310868