ACS Energy Letters, volume 2, issue 4, pages 739-744
Suppressing Deep Traps in PbS Colloidal Quantum Dots via Facile Iodide Substitutional Doping for Solar Cells with Efficiency >10%
Alexandros Stavrinadis
1
,
S Pradhan
1
,
Paris Papagiorgis
2
,
G. Itskos
2
,
Publication type: Journal Article
Publication date: 2017-03-06
Materials Chemistry
Chemistry (miscellaneous)
Energy Engineering and Power Technology
Fuel Technology
Renewable Energy, Sustainability and the Environment
Abstract
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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