Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 9, Issue 5, Pages 4898-4907Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.6b15411
Keywords
organic solar cell; spray coating; reduced graphene oxide; zinc oxide; hybrid cathode interlayer; in situ thermal reduction; in situ thermal annealing
Funding
- Foundation for Innovation Research Groups of the National Natural Science Foundation of China (NSFC) [61421002]
- NSFC [61675041]
- Project of Science and Technology of Sichuan Province [2016HH0027]
- Fundamental Research Funds for the Central Universities [ZYGX2010Z004]
- China Scholarship Council
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A novel hybrid cathode interlayer (CIL) consisting of reduced graphene oxide and zinc oxide (ZnO) is realized in the inverted organic solar cells (OSCs). A dual nozzle spray coating system and facile one-step in situ thermal reduction/annealing (ITR/ITA) method are introduced to precisely control the components of the CIL, assemble ZnO with graphene oxide, and reduce graphene oxide into in situ thermal reduced graphene oxide (IT-RGO), simultaneously. The ZnO:IT-RGO hybrid CIL shows high electric conductivity, interconnecting nanostructure, and matched energy level, which leads to a significant enhancement in the power conversion efficiency from 6.16% to 8.04% for PTB7:PC71BM and from 8.02% to 9.49% for PTB7-Th:PC71BM-based OSCs, respectively. This newly developed spray-coated ZnO:IT-RGO hybrid CIL based on one-step ITR/ITA treatment has the high potential to provide a facile pathway to fabricate the large-scale, fast fabrication, and high performance OSCs.
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