Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 11, Issue 37, Pages 33759-33769Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.9b07089
Keywords
quantum-dot; solar cell; single-walled carbon nanotube; charge collection; photo-CELIV; diffusion length
Funding
- National Research Foundation of Korea (NRF) - Korea government (MSIT) [NRF-2019R1F1A1045506]
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Improving charge collection is one of the key issues for high-performance PbS colloidal quantum dot photovoltaics (CQDPVs) due to the considerable charge loss resulting from the low mobility and large defect densities of the 1,2-ethanedithiol-treated PbS quantum dot hole-transporting layer (HTL). To overcome these limitations, single-walled carbon nanotubes (SWNTs) and C-60-encapsulated SWNTs (C-60@SVVNTs) are incorporated into the HTL in CQDPVs. SWNT-incorporated CQDPV demonstrates a significantly improved short-circuit current density (J(SC)), and C-60@SWNT-incorporated CQDPV exhibits an even higher J(SC) than that of pristine SWNT. Both result in improved power-conversion efficiencies. Hole-selective, photoinduced charge extraction with linearly increasing voltage measurements demonstrates that SWNT or C-60@SWNT incorporation improves hole-transporting behavior, rendering suppressed charge recombination and enhanced mobility of the HTL. The enhanced p-type characteristics and the improved hole diffusion lengths of SWNT- or C-60@SWNT-incorporated HTL bring improvement of the entire hole-transporting length and enable lossless hole collection, which results in the J(SC) enhancement of the CQDPVs.
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