@article {44206,
	title = {Role of surface ligands in determining the electronic properties of quantum dot solids and their impact on photovoltaic figure of merits},
	journal = {Nanoscale},
	volume = {10},
	year = {2018},
	month = {JAN},
	pages = {1072-1080},
	type = {Article},
	abstract = {<p>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 the 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. Furthermore, we correlate these results with performance, stability and recombination processes in the respective photovoltaic devices. Our results highlight the critical role of surface chemistry in 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 the 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.</p>},
	issn = {2040-3364},
	doi = {10.1039/c7nr06116a},
	author = {Goswami, Prasenjit N. and Mandal, Debranjan and Rath, Arup K.}
}
@article {47637,
	title = {Reduction of hydroxyl traps and improved coupling for efficient and stable quantum dot solar cells},
	journal = {ACS Applied Materials \& Interfaces},
	volume = {13},
	year = {2021},
	month = {OCT },
	pages = {46549-46557},
	type = {Article},
	abstract = {Progress 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.},
	keywords = {ligand, mobility, quantum dot, solar cell, surface passivation},
	issn = {1944-8244},
	doi = {10.1021/acsami.1c11214},
	author = {Mandal, Debranjan and Dambhare, V. Neha and Rath, Arup K.}
}
