期刊
ACS ENERGY LETTERS
卷 2, 期 4, 页码 739-744出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsenergylett.7b00091
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资金
- European Research Council (ERC) [725165]
- Spanish Ministry of Economy and Competitiveness (MINECO)
- Fondo Europeo de Desarrollo Regional (FEDER) [MAT2014-56210-R]
- AGAUR under the SGR Grant [2014SGR1548]
- EC under the Graphene Flagship [CNECT-ICT-604391]
- Fundacio Privada Cellex
- Spanish Ministry of Economy and Competitiveness, through the Severo Ochoa Programme for Centres of Excellence in RD [SEV-2015-0522]
- ICREA Funding Source: Custom
Surface passivation of PbS colloidal quantum dots (QDs) with iodide has been used in highly efficient solar cells. Iodide passivation is typically achieved by ligand-exchange processes on QD films. Complementary to this approach, herein we present a nonintrusive solution-based strategy for doping QDs with iodide to further optimize solar cell performance. The doping step is applied in situ at the end of the synthesis of the QDs. The optimum precursor I/Pb ratio is found to be in the 1.5-3% range at which iodide substitutes S without excessively altering the dots' surface chemistry. This allows for band engineering and decreasing the density of deep trap states of the QDs, which taken together lead to PbS QD solar cells with efficiency in excess of 10%.
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