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Improved exciton dissociation efficiency by a carbon-quantum-dot doped workfunction modifying layer in polymer solar cells

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Abstract
In addition to the phase-separated morphology of donor and acceptor, the internal field created by work-function difference between cathode and anode can also influence the exciton dissociation probability. In this study, we have demonstrated enhanced photovoltaic performance by increasing exciton dissociation efficiency. To improve both work-function modification effect and charge transport properties, we have incorporated novel carbon quantum dots (CQD) having NH2 ligands into the polyethyleneimine (PEI) work-function modifying layer as a dopant. A study of net photocurrent density as a function of effective voltage showed that devices with a CQD-doped PEI layer had a much higher charge separation probability compared to devices with a pristine PEI layer. A Kelvin-probe force microscopy study demonstrated that a CQD-doped PEI layer induced lower work-function of ITO than that of ITO with a pristine PEI, which induced a stronger internal field. This strengthened internal field induced better exciton dissociation efficiency, thereby improving solar cell performance.
Author(s)
박수정이흔정Seok Won ParkTae Eun KimSung Heum Park정윤경조신욱
Issued Date
2021
Type
Article
Keyword
Organic solar cellsExciton dissociation efficiencyInternal fieldCarbon quantum dot
DOI
10.1016/j.cap.2020.10.019
URI
https://oak.ulsan.ac.kr/handle/2021.oak/9492
https://ulsan-primo.hosted.exlibrisgroup.com/primo-explore/fulldisplay?docid=TN_cdi_nrf_kci_oai_kci_go_kr_ARTI_9701681&context=PC&vid=ULSAN&lang=ko_KR&search_scope=default_scope&adaptor=primo_central_multiple_fe&tab=default_tab&query=any,contains,Improved%20exciton%20dissociation%20efficiency%20by%20a%20carbon-quantum-dot%20doped%20workfunction%20modifying%20layer%20in%20polymer%20solar%20cells&sortby=rank&pcAvailability=true
Publisher
CURRENT APPLIED PHYSICS
Location
네덜란드
Language
영어
ISSN
1567-1739
Citation Volume
21
Citation Number
1
Citation Start Page
140
Citation End Page
146
Appears in Collections:
Natural Science > Physics
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