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Role of surface ligands in determining the electronic properties of quantum dot solid and their impact in photovoltaic figure of merits

Abstract

Surface chemistry plays a crucial role in determining the electronic properties of quantum dot solids and may well be the key to mitigate loss processes involved in quantum dot solar cells. Surface ligands help to maintain the shape and size of the individual dots in solid films, to preserve clean energy band gap of the individual particles and to control charge carrier conduction across solid films, in turn regulating their performance in photovoltaic applications. In this report, we show that the changes in size, shape and functional groups of small chain organic ligands enable us to modulate mobility, dielectric constant and carrier doping density of lead sulfide quantum dot solids. Further, we correlate these results with performance, stability and recombination processes in the respective photovoltaic devices. Our results highlight the critical role of surface chemistry on the electronic properties of quantum dots. The role of the size, functionality and the surface coverage of the ligands in determining charge transport properties and stability of quantum dot solids have been discussed. Our findings, when applied in designing new ligands with higher mobility and improved passivation of quantum dot solids, can have important implications for the development of high-performance quantum dot solar cells.

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Publication details

The article was received on 17 Aug 2017, accepted on 04 Dec 2017 and first published on 04 Dec 2017


Article type: Paper
DOI: 10.1039/C7NR06116A
Citation: Nanoscale, 2017, Accepted Manuscript
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    Role of surface ligands in determining the electronic properties of quantum dot solid and their impact in photovoltaic figure of merits

    P. N. Goswami, D. Mandal and A. K. Rath, Nanoscale, 2017, Accepted Manuscript , DOI: 10.1039/C7NR06116A

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