Enhancing carrier transport in Cs2AgBiBr6 double perovskites through multifunctional ferroelectric polymer doping
Abstract
Cs2AgBiBr6 lead-free double perovskites are promising materials for optoelectronic applications but suffer from limited carrier transport due to defects and strong electron–phonon coupling. In this work, we introduce a multifunctional doping strategy using the ferroelectric polymer polyvinylidene fluoride (PVDF) to simultaneously address these challenges. PVDF modulates film crystallization to reduce defects, relaxes lattice strain to weaken electron–phonon coupling, and—after electrical polarization—provides a built-in electric field that promotes charge separation. As a result, PVDF-doped Cs2AgBiBr6 solar cells achieve a champion power conversion efficiency of 1.91%, representing a 40% improvement over the control device (1.36%), with much improved stability. This work presents a simple and effective approach to improving carrier dynamics in double perovskites for broader optoelectronic applications.
Article Details
Journal Info
Applied Physics Letters
American Institute of Physics
Authors (9)
Tongming Rao
Zhejiang Key Laboratory of Quantum State Control and Optical Field Manipulation, School of Science, Department of Physics, Zhejiang Sci-Tech University 1 , Hangzhou 310018,
Wanjiang Wang
Zhejiang Key Laboratory of Quantum State Control and Optical Field Manipulation, School of Science, Department of Physics, Zhejiang Sci-Tech University 1 , Hangzhou 310018,
Jie Chen
Daquan Chen
Zhejiang Key Laboratory of Quantum State Control and Optical Field Manipulation, School of Science, Department of Physics, Zhejiang Sci-Tech University 1 , Hangzhou 310018,
Chaoling Zhou
Zhejiang Key Laboratory of Quantum State Control and Optical Field Manipulation, School of Science, Department of Physics, Zhejiang Sci-Tech University 1 , Hangzhou 310018,
Ping Lin
State Key Laboratory of Structural Chemistry, Fujian Science & Technology Innovation Laboratory for Optoelectronic Information of China
Zhenyi Ni
Can Cui
Lingbo Xu
Zhejiang Key Laboratory of Quantum State Control and Optical Field Manipulation, School of Science, Department of Physics, Zhejiang Sci-Tech University 1 , Hangzhou 310018,