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Planar Organic Bilayer Heterojunctions Fabricated on Water with Ultrafast Donor-to-Acceptor Charge Transfer

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Abstract
Herein, planar heterojunctions comprising a nonfullerene small molecular acceptor (NFA) and a polymer donor are demonstrated by transferring polymer films on a water surface on top of NFA layers. So far, most solution-processed layer-by-layer architectures have been reported as sequentially deposited bulk heterojunctions or pseudo-bilayers because mixed regions at the donor/acceptor interface are inevitable in these methods. By virtue of the unique properties of conjugated polymers such as hydrophobicity and spontaneous film formation on a water surface, the fabrication of NFA/polymer bilayer nanostructures is clearly demonstrated by dramatically simplified methods. These bilayers are successfully rendered into bilayer organic solar cells achieving a power conversion efficiency of up to 7.47%. This reflects that these bilayers have appropriate morphological and optoelectrical properties to be operated as photoactive layers in photovoltaic devices. Further, ultrafast charge transfer from the polymer donor to the NFA and fast carrier mobility are investigated by transient-absorption spectroscopy and photoinduced chargeextraction measurements. Fast carrier dynamics are observed, which are essential for the efficient harvest of excitons in photovoltaic devices. It is believed that the formation of planar heterojunctions on water can offer technical diversity for the fabrication methods of the photovoltaic devices.
Author(s)
Tack Ho LeeWon-Woo ParkSong Yi Park조신욱Oh-Hoon KwonJin Young Kim
Issued Date
2021
Type
Article
Keyword
bilayer heterojunctionscharge transferfilm transfer on waternonfullerene acceptorsorganic solar cells
DOI
10.1002/solr.202100326
URI
https://oak.ulsan.ac.kr/handle/2021.oak/8987
https://ulsan-primo.hosted.exlibrisgroup.com/primo-explore/fulldisplay?docid=TN_cdi_crossref_primary_10_1002_solr_202100326&context=PC&vid=ULSAN&lang=ko_KR&search_scope=default_scope&adaptor=primo_central_multiple_fe&tab=default_tab&query=any,contains,Planar%20Organic%20Bilayer%20Heterojunctions%20Fabricated%20on%20Water%20with%20Ultrafast%20Donor-to-Acceptor%20Charge%20Transfer&offset=0&pcAvailability=true
Publisher
SOLAR RRL
Location
독일
Language
영어
ISSN
2367-198X
Citation Volume
5
Citation Number
8
Citation Start Page
2100326
Citation End Page
2100326
Appears in Collections:
Engineering > Material Engineering
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