Journal
ACS ENERGY LETTERS
Volume 3, Issue 12, Pages 2931-2939Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsenergylett.8b01754
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Funding
- NASA through MACES [NNX15AQ01A]
- UCSC Committee on Research Special Research Grant
- Office of Science, Office of Basic Energy Sciences, of the U.S. Department of Energy [DE-AC02-05CH11231]
- NSF MRI [1428992]
- NASA EPSCoR [NNX15AM83A]
- US-Egypt Science and Technology (ST) Joint Fund
- United States Agency for International Development (USAID)
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Long-chain saturated hydrocarbons and alkoxysilanes are ligands that are commonly used to passivate perovskite quantum dots (PQDs) to enhance their stability and optical properties. However, the insulating nature of these capping ligands creates an electronic energy barrier and impedes interparticle electronic coupling, thereby limiting device applications. One strategy to solve this problem is the use of short conductive aromatic ligands that allow delocalization of the electronic wave function from the PQDs, which, in turn, facilitates charge transport between PQDs by lowering the energy barrier. This is demonstrated with methylammonium lead bromide (MAPbBr(3)) QDs prepared using benzylamine (BZA) and benzoic acid (BA) capping ligands. Optimized BZA-BA-MAPbBr(3) QDs are highly stable and show very high photoluminescence (PL) quantum yield (QY) (86%). More importantly, the BZA-BA-MAPbBr(3) QD film exhibits higher conductivity and carrier lifetime and more efficient charge extraction compared to PQDs with insulating ligands, as indicated by electrochemical measurements and transient photocurrent and photovoltage spectroscopy.
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