Issue 24, 2024

Ordered growth of Cs2AgBiBr6 double perovskites on PEIE-decorated SnO2 for efficient planar solar cells

Abstract

Cs2AgBiBr6 double perovskites are considered potential alternatives to lead-based perovskites for solar cell applications owing to their advantages of stability and non-toxicity. However, the disordered arrangement of Ag/Bi octahedra leads to the formation of self-trapped excitons (STEs) and hinders carrier transport, which is a severe problem in planar solar cells due to inferior charge extraction to mesoporous solar cells. Herein, we employ ethoxylated polyethylenimine (PEIE) to regulate the growth of Cs2AgBiBr6 films by sandwiching it between an SnO2 electron transport layer and a perovskite layer. On the one hand, the introduction of PEIE delays the growth of Cs2AgBiBr6 and improves the ordering extent of the Ag/Bi octahedra. This inhibits the formation of STEs and facilitates carrier transport, which profoundly boosts the short-circuit current density. On the other hand, PEIE modulates the energy level of the SnO2 electron transport layer to match that of Cs2AgBiBr6, which reduces the open-circuit voltage loss. Consequently, the power conversion efficiency (PCE) of the planar solar cell increases by 250% after PEIE modification from 0.59% to 1.52%. In addition, the PEIE-decorated device maintains over 90% of its initial PCE for 30 days under ambient conditions, demonstrating good environmental stability.

Graphical abstract: Ordered growth of Cs2AgBiBr6 double perovskites on PEIE-decorated SnO2 for efficient planar solar cells

Supplementary files

Article information

Article type
Paper
Submitted
16 Jan 2024
Accepted
27 Mar 2024
First published
28 Mar 2024

J. Mater. Chem. C, 2024,12, 8697-8704

Ordered growth of Cs2AgBiBr6 double perovskites on PEIE-decorated SnO2 for efficient planar solar cells

W. Wang, L. Hou, H. Hu, B. Chang, Y. Yuan, P. Lin, P. Wang, X. Wu, X. Yu, L. Xu and C. Cui, J. Mater. Chem. C, 2024, 12, 8697 DOI: 10.1039/D4TC00219A

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