Journal
ACS ENERGY LETTERS
Volume 4, Issue 8, Pages 1872-1879Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsenergylett.9b01041
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Funding
- Center for Hybrid Organic Inorganic Semiconductors for Energy (CHOISE), an Energy Frontier Research Center - Office of Basic Energy Sciences, Office of Science, within the U.S. Department of Energy [DE-AC36-08GO28308]
- National Renewable Energy Laboratory
- Princeton Center for Complex Materials (PCCM)
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Good charge selective contacts are vital to achieving efficient perovskite solar cells. The selectivity of such a contact is determined by its energetic offset or alignment with the bands of the perovskite absorber and, most importantly, by its interfacial recombination losses. In this study, we use single-walled carbon nanotubes (SWCNTs) as a high-mobility hole extraction layer at the interface with a perovskite absorber. When employed as a charge-transfer cascade-like structure with a low-mobility hole-selective contact, this configuration can suppress the interfacial recombination through the rapid removal of holes from the interface region. Reducing these recombination losses in turn results in very low voltage losses of less than 340 mV in n-i-p perovskite solar cells.
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