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Simultaneous Improvement of Efficiency and Stability of Non-Fullerene-Based Organic Solar Cells Via Sequential Deposition of Single Donor and Binary Acceptor

Title
Simultaneous Improvement of Efficiency and Stability of Non-Fullerene-Based Organic Solar Cells Via Sequential Deposition of Single Donor and Binary Acceptor
Authors
Min S.Han S.H.Park C.Ryu K.Y.Kim K.
Ewha Authors
김경곤
SCOPUS Author ID
김경곤scopus
Issue Date
2021
Journal Title
Solar RRL
ISSN
2367-198XJCR Link
Citation
Solar RRL vol. 5, no. 10
Keywords
burn-innon-fullerene acceptorsorganic solar cellssequential depositionstability
Publisher
John Wiley and Sons Inc
Indexed
SCIE; SCOPUS WOS scopus
Document Type
Article
Abstract
Non-fullerene acceptor (NFA)-based organic solar cells often exhibit significant cell degradation in power conversion efficiency (PCE) in the early stages of operation, called “burn-in.” Generally, to fabricate NFA-based solar cells, binary blend solution deposition (binary BSD) of a conjugated polymer and an NFA is utilized. Herein, the reasons for burn-in are investigated by aging organic photovoltaic cells with independent control of temperature and light. The results reveal that burn-in is mainly due to a rapid increase in the interfacial resistance (R int) rather than photo-oxidation of the components or oxidation of the electrode. This R int is effectively suppressed by constructing a ternary photoactive layer through the sequential deposition of a polymer solution and a binary acceptor solution consisting of an NFA and a fullerene acceptor (ternary sequential deposition [ternary SqD]). Under the illumination of 1 sun and thermal annealing at 80 °C for 500 h, the binary BSD exhibits a reduction in efficiency of 63% and 59%, respectively, whereas the ternary SqD demonstrates a reduction of only 32% and 35%, respectively. In addition, the ternary SqD improves the PCE on using fullerene acceptors to enhance light harvesting at short wavelengths. © 2021 Wiley-VCH GmbH
DOI
10.1002/solr.202100592
Appears in Collections:
자연과학대학 > 화학·나노과학전공 > Journal papers
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