Multifunctional Conjugated Ligand Engineering for Stable and Efficient Perovskite Solar Cells
Abstract
Surface passivation is an effective way to boost the efficiency and stability of perovskite solar cells (PSCs). However, a key challenge faced by most of the passivation strategies is reducing the interface charge recombination without imposing energy barriers to charge extraction. Here, a novel multifunctional semiconducting organic ammonium cationic interface modifier inserted between the light‐harvesting perovskite film and the hole‐transporting layer is reported. It is shown that the conjugated cations can directly extract holes from perovskite efficiently, and simultaneously reduce interface non‐radiative recombination. Together with improved energy level alignment and the stabilized interface in the device, a triple‐cation mixed‐halide medium‐bandgap PSC with an excellent power conversion efficiency of 22.06% (improved from 19.94%) and suppressed ion migration and halide phase segregation, which lead to a long‐term operational stability, is demonstrated. This strategy provides a new practical method of interface engineering in PSCs toward improved efficiency and stability.
Document Details
- Document Type
- Pub Defense Publication
- Publication Date
- Jul 05, 2021
- Source ID
- 10.1002/adma.202100791
Entities
People
- Aidan H. Coffey
- Blake P Finkenauer
- Chenhui Zhu
- Harindi R. Atapattu
- Jianguo Mei
- Kang L. Wang
- Ke Chen
- Ke Ma
- Kenneth R Graham
- Letian Dou
- Libai Huang
- Qiuchen Zhao
- So Min Park
- Yao Gao
Organizations
- Advanced Light Source
- Office of Basic Energy Sciences
- Office of Naval Research
- Purdue University
- United States Department of Energy
- University of Kentucky