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Design rules for minimizing voltage losses in high-efficiency organic solar cells

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Title: Design rules for minimizing voltage losses in high-efficiency organic solar cells
Authors: Qian, D
Zheng, Z
Yao, H
Tress, W
Hopper, T
Chen, S
Li, S
Liu, J
Chen, S
Zhang, J
Liu, X-K
Gao, B
Ouyang, L
Jin, Y
Pozina, G
Buyanova, I
Chen, W
Inganäs, O
Coropceanu, V
Bredas, J-L
Yan, H
Hou, J
Zhang, F
Bakulin, A
Gao, F
Item Type: Journal Article
Abstract: The open-circuit voltage of organic solar cells is usually lower than the values achieved in inorganic or perovskite photovoltaic devices with comparable bandgaps. Energy losses during charge separation at the donor–acceptor interface and non-radiative recombination are among the main causes of such voltage losses. Here we combine spectroscopic and quantum-chemistry approaches to identify key rules for minimizing voltage losses: (1) a low energy offset between donor and acceptor molecular states and (2) high photoluminescence yield of the low-gap material in the blend. Following these rules, we present a range of existing and new donor–acceptor systems that combine efficient photocurrent generation with electroluminescence yield up to 0.03%, leading to non-radiative voltage losses as small as 0.21 V. This study provides a rationale to explain and further improve the performance of recently demonstrated high-open-circuit-voltage organic solar cells.
Issue Date: 16-Jul-2018
Date of Acceptance: 8-Jun-2018
URI: http://hdl.handle.net/10044/1/61247
DOI: 10.1038/s41563-018-0128-z
ISSN: 1476-1122
Publisher: Nature Publishing Group
Start Page: 703
End Page: 709
Journal / Book Title: Nature Materials
Volume: 17
Copyright Statement: © 2018 Springer Nature Limited. All rights reserved.
Sponsor/Funder: Commission of the European Communities
The Royal Society
Funder's Grant Number: 639750
UF130178
Keywords: Science & Technology
Physical Sciences
Technology
Chemistry, Physical
Materials Science, Multidisciplinary
Physics, Applied
Physics, Condensed Matter
Chemistry
Materials Science
Physics
SMALL-MOLECULE ACCEPTOR
CHARGE-TRANSFER STATES
QUANTUM EFFICIENCY
ENERGY-LOSSES
POLYMER
DONOR
RECOMBINATION
OPTIMIZATION
SEPARATION
HOT
Nanoscience & Nanotechnology
Publication Status: Published
Online Publication Date: 2018-07-16
Appears in Collections:Chemistry
Faculty of Natural Sciences