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

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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): C-70-based organic solar cells (OSCs). Even a low dose of donors (similar to 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: C-70 (1:9) OSCs.
Publisher
AMER CHEMICAL SOC
Issue Date
2018-01
Language
English
Article Type
Article
Keywords

OPEN-CIRCUIT VOLTAGE; PHOTOVOLTAIC CELLS; FILL FACTOR; POLYMER; FULLERENE; BLENDS

Citation

ACS OMEGA, v.3, no.1, pp.929 - 936

ISSN
2470-1343
DOI
10.1021/acsomega.7b01652
URI
http://hdl.handle.net/10203/241362
Appears in Collection
EE-Journal Papers(저널논문)EEW-Journal Papers(저널논문)
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