Columnar-Structured Low-Concentration Donor Molecules in Bulk Heterojunction Organic Solar Cells

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Title
Columnar-Structured Low-Concentration Donor Molecules in Bulk Heterojunction Organic Solar Cells
Author(s)
Ji-Won Seo; Jong Hun Kim; Mincheol Kim; Seon-Mi Jin; Sang-Hoon Lee; changsoon Cho; Eunji Lee; Seunghyup Yoo; Jeong Young Park; Jung-Yong Lee
Publication Date
2018-01
Journal
ACS Omega, v.3, no.1, pp.929 - 936
Publisher
ACS Publications
Abstract
We investigate the arrangement of donor molecules in vacuum-deposited bulk heterojunction (BHJ) 1,1-bis-(4-bis(4-methyl-phenyl)-amino-phenyl)-cyclohexane (TAPC):C70-based organic solar cells (OSCs). Even a low dose of donors (∼10%) forms columnar structures that provide pathways for efficient hole transport in the BHJ layer; however, these structures disappear at donor concentrations below 10%, generating disconnected and isolated hole pathways. The formation of columnar donor structures is confirmed by the contrast of the contact potential difference, measured by Kelvin probe force microscopy, and by the trap-assisted charge injection at low donor concentrations. The mobility of electrons and holes is well balanced in OSCs owing to the preservation of the hole mobility at such low donor concentrations, consequently maximizing the internal quantum efficiency of the OSCs. A high power conversion efficiency of 6.24% was achieved in inverted TAPC:C70 (1:9) OSCs. © 2018 American Chemical Society
URI
https://pr.ibs.re.kr/handle/8788114/4710
ISSN
2470-1343
Appears in Collections:
Center for Nanomaterials and Chemical Reactions(나노물질 및 화학반응 연구단) > Journal Papers (저널논문)
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