Reduction of hydroxyl traps and improved coupling for efficient and stable quantum dot solar cells

TitleReduction of hydroxyl traps and improved coupling for efficient and stable quantum dot solar cells
Publication TypeJournal Article
Year of Publication2021
AuthorsMandal, D, V. Dambhare, N, Rath, AK
JournalACS Applied Materials & Interfaces
Volume13
Issue39
Pagination46549-46557
Date PublishedOCT
Type of ArticleArticle
ISSN1944-8244
Keywordsligand, mobility, quantum dot, solar cell, surface passivation
AbstractProgress in quantum dot (QD)-based solar cells has been underpinned by the improvements in surface passivation and advancements in device engineering. Acute control over the surface properties is crucial to restrict the formation of in-gap trap states and improve the QD coupling in achieving conducting QD films. In this report, we demonstrate a solution-phase hybrid passivation strategy, which is beneficial in removing detrimental hydroxyl traps and improving the coupling between QDs by reducing the interdot distance. Advancement in surface passivation is translated to the long carrier lifetime, higher carrier mobility, and superior protection toward degradations in QD solids. The performance of solar cell devices is increased by 26% to reach an efficiency of 10.6%, compared to the state-of-the-art lead halide passivated solar cells. The improvement in solar cell performance is supported by the reduction of trap states and an 80 nm increase in thickness of the light-absorbing QD layer.
DOI10.1021/acsami.1c11214
Type of Journal (Indian or Foreign)Foreign
Impact Factor (IF)9.229
Divison category: 
Physical and Materials Chemistry

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