Origins of the open-circuit voltage in ternary organic solar cells and design rules for minimized voltage losses
Journal article, 2023
The power conversion efficiency of ternary organic solar cells (TOSCs), consisting of one host binary blend and one guest component, remains limited by large voltage losses. The fundamental understanding of the open-circuit voltage (V OC) in TOSCs is controversial, limiting rational design of the guest component. In this study, we systematically investigate how the guest component affects the radiative and non-radiative related parts of V OC of a series of TOSCs using the detailed balanced principle. We highlight that the thermal population of charge-transfer and local exciton states provided by the guest binary blend (that is, the guest-component-based binary blend) has a significant influence on the non-radiative voltage losses. Ultimately, we provide two design rules for enhancing the V OC in TOSCs: high emission yield for the guest binary blend and similar charge-transfer-state energies for host/guest binary blends; high miscibility of the guest component with the low gap component in the host binary blend.
Author
Yuming Wang
Linköping University
Universiteit Hasselt
Jianwei Yu
Linköping University
Rui Zhang
Linköping University
Jun Yuan
Linköping University
Central South University
Sandra Hultmark
Chalmers, Chemistry and Chemical Engineering, Applied Chemistry
Catherine E. Johnson
Imperial College London
Nathaniel P. Gallop
Imperial College London
Bernhard Siegmund
Universiteit Hasselt
D. P. Qian
Linköping University
Huotian Zhang
Linköping University
Y. P. Zou
Central South University
M. Kemerink
Heidelberg University
Linköping University
Artem A. Bakulin
Imperial College London
Christian Müller
Chalmers, Chemistry and Chemical Engineering, Applied Chemistry
K. Vandewal
Universiteit Hasselt
Xian Kai Chen
Soochow University
Feng Gao
Linköping University
Nature Energy
20587546 (eISSN)
Vol. 8 9 978-988Next Generation Organic Solar Cells (OPV 2.0)
Swedish Research Council (VR) (2016-06146), 2017-01-01 -- 2022-12-31.
Swedish Research Council (VR) (2016-06146), 2017-01-01 -- 2022-12-31.
Swedish Research Council (VR) (2016-06146), 2017-01-01 -- 2022-12-31.
Subject Categories
Energy Engineering
Other Electrical Engineering, Electronic Engineering, Information Engineering
DOI
10.1038/s41560-023-01309-5