Journal
ACS ENERGY LETTERS
Volume 4, Issue 4, Pages 960-967Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsenergylett.9b00053
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Funding
- National Key Research Projects [2016YFA0202402]
- Natural Science Foundation of Jiangsu Province of China [BK20170337]
- National Natural Science Foundation of China [61674111]
- 111 projects
- China Scholarship Council (CSC)
- Japan Society for the Promotion of Science (JSPS KAKENHI) [JP17H035036]
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Lead chalcogenides colloidal quantum dot (PbS CQD) solar cells employing an ordered bulk heterojunction (OBHJ) structure allow sufficient utilization of solar energy and at the same time ensure efficient charge extractions. However, the interfacial deficiency was determined to be a significant limiting factor for the further improvement of efficiency. Herein, a finely interpenetrating OBHJ structure between zinc oxide nanowire (ZnO NW) arrays and PbS CQDs was achieved by simultaneously controlling the growth orientation of ZnO NWs and introducing convective assembly as the CQD deposition technique. The inherent directionality during the assembly process leads to dense packing and efficient infiltration of CQDs, forming a valid OBHJ structure. Additionally, a self-assembled monolayer was introduced to further improve the V-oc deficit. As a result, a record PCE of 9.92% has been demonstrated for OBHJ structured CQD solar cells that are compatible with low-temperature and scalable manufacturing processes.
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