Chirality transfer from chiral perovskite to molecular dopants via charge transfer states
Journal
Nature Communications
Journal Volume
17
Journal Issue
1
Start Page
3757
ISSN
20411723
Date Issued
2026-12
Author(s)
Chen, Guan-Lin
Tsai, Hsinhan
Shrestha, Reshna
Forde, Aaron
Crawley, Matthew R.
Wei, Cunyi
Tseng, Kai-Wei
Liu, Zhe-Yu
Tong, Xiao
Cotlet, Mircea
Tretiak, Sergei
Nie, Wanyi
Abstract
Chiral perovskites are semiconductors with broken mirror symmetries. Their photo responses are often constrained in the UV range. In this work, we demonstrate that doping 2,3,5,6-Tetrafluoro-7,7,8,8-tetracyanoquinodimethane in the chiral perovskite matrix introduces a visible light absorption feature through the emerging charge-transfer electronic states. These charge-transfer states exhibits circular dichroism inherited from the chiral host, indicating effective chirality transfer from host to guest component via electronic coupling. Quantum-chemical modeling identifies a strong wave function overlap between an electron and a hole of the guest-host in a closely packed crystal configuration promoting the charge transfer state’s optical activity. We further integrate the doped chiral perovskite film into photodetectors and demonstrate a selective detection of circularly polarized light in both UV and visible regions. Our results suggest a universal approach of introducing visible photo absorption states to the chiral matrix to broaden the optical active range while enhancing the electrical conductivity.
Publisher
Nature Research
Type
journal article