Photoinduced energy-level realignment at interfaces between organic semiconductors and metal-halide perovskites

In contrast to the common conception that the interfacial energy-level alignment is affixed once the interface is formed, we demonstrate that heterojunctions between organic semiconductors and metal-halide perovskites exhibit huge energy-level realignment during photoexcitation. Importantly, the photoinduced level shifts occur in the organic component, including the first molecular layer in direct contact with the perovskite. This is caused by charge-carrier accumulation within the organic semiconductor under illumination and the weak electronic coupling between the junction components.

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Author details:	Fengshuo Zu ORCiD GND, Jonathan Warby ORCiD, Martin Stolterfoht ORCiD, Jinzhao Li ORCiD GND, Dongguen Shin ORCiD, Eva Unger ORCiD, Norbert Koch ORCiD GND
DOI:	https://doi.org/10.1103/PhysRevLett.127.246401
ISSN:	0031-9007
ISSN:	1079-7114
Pubmed ID:	https://pubmed.ncbi.nlm.nih.gov/34951794
Title of parent work (English):	Physical review letters
Publisher:	American Physical Society
Place of publishing:	College Park
Publication type:	Article
Language:	English
Date of first publication:	2021/12/08
Publication year:	2021
Release date:	2024/04/24
Volume:	127
Issue:	24
Article number:	246401
Number of pages:	6
Funding institution:	Deutsche Forschungs gemeinschaft (DFG, German Research Foundation)German Research Foundation (DFG) [182087777-SFB951, 423749265-SPP2196, 424394788-SPP2196]
Organizational units:	Mathematisch-Naturwissenschaftliche Fakultät / Institut für Physik und Astronomie
DDC classification:	5 Naturwissenschaften und Mathematik / 53 Physik / 530 Physik
	5 Naturwissenschaften und Mathematik / 55 Geowissenschaften, Geologie / 550 Geowissenschaften
Peer review:	Referiert
Publishing method:	Open Access / Bronze Open-Access