Journal
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
Volume 3, Issue 14, Pages 1928-1933Publisher
AMER CHEMICAL SOC
DOI: 10.1021/jz300723h
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Funding
- AFOSR under the Polymer Chemistry Task in the Directorate of Chemistry and Life Sciences [FA9550-12-1-0069]
- Wenzhou Medical College
- Department of Education [T200917]
- Ministry of Education of China [IRT1077, 211069, 20103321120003]
- National Thousand Talents Program of China
- Ministry of Science and Technology of China [2009DFB30380]
- NSFC-NSF MWN [NSF-DMR 1106160]
- Direct For Mathematical & Physical Scien
- Division Of Materials Research [1106160] Funding Source: National Science Foundation
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In this study, we have rationally designed and successfully developed sulfated graphene oxide (GO-OSO3H) with -OSO3H groups attached to the carbon basal plane of reduced GO surrounded with edge-functionalized -COOH groups. The resultant GO-OSO3H is demonstrated to be an excellent hole extraction layer (HEL) for polymer solar cells (PSCs) because of its proper work function for Ohmic contact with the donor polymer, its reduced basal plane for improving conductivity, and its -OSO3H/-COOH groups for enhancing solubility for solution processing. Compared with that of GO, the much improved conductivity of GO-OSO3H (1.3 S m(-1) vs 0.004 S m(-1)) leads to greatly improved fill factor (0.71 vs 0.58) and power conversion efficiency (4.37% vs 3.34%) of the resulting PSC devices. Moreover, the device performance of GO-OSO3H is among the best reported for intensively studied poly(3-hexylthiophene):[6,6]-phenyl-C61 butyric acid methyl ester (P3HT:PCBM) devices. Our results imply that judiciously functionalized graphene materials can be used to replace existing HEL materials for specific device applications with outstanding performance.
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