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Controlling interfacial defects and energy level aligment at CZTS/TiO2 heterojunction for photovoltaic applications

Nisika (2022-09-23)

The quaternary semiconductor kesterite-structured Cu2ZnSnS4 (CZTS) has been widely recognized as a potential light-absorbing material for thin-film solar cells. With all non-toxic and earth-abundant constituent elements, ...
Energy level alignment and nanoscale investigation of a-TiO2/Cu-Zn-Sn-S interface for alternative electron transport layer in earth abundant Cu-Zn-Sn-S solar cells

Nisika; Kaur, K.; Arora, K.; Chowdhury, A. H.; Bahrami, B.; Qiao, Q.; Kumar, M. (2021-08-14)

Efficiency of earth abundant and pure sulfide kesterite Cu-Zn-Sn-S (CZTS) solar cell has been stagnant around 9.4% for years, while its counterpart Cu-In-Ga-Se (CIGS) reports an efficiency of more than 22%. Low open circuit ...
Engineering Cu2ZnSnS4grain boundaries for enhanced photovoltage generation at the Cu2ZnSnS4/TiO2heterojunction: A nanoscale investigation using Kelvin probe force microscopy

Nisika; Ghosh, A.; Kaur, K.; Bobba, R.S.; Qiao, Q.; Kumar, M. (2022-08-18)

Over the past several years, kesterite Cu2ZnSnS4 (CZTS) absorber has been investigated comprehensively; however, the performance is still hampered by a large open-circuit voltage deficit associated with CZTS bulk defects ...
Nanoscale charge transport and local surface potential distribution to probe the defect passivation in Cr-substituted earth abundant CZTS absorber layer

Kaur, K.; Nisika; Chowdhury, A.H.; Qiao, Q. (2021-02-23)

The non-stochiometric deviations in CZTS often results in certain detrimental point defects that act as trap centers causing non-radiative recombination and potential fluctuations, eventually results in large open circuit ...
A new strategy of defect passivation in kesterite absorber layer to engineer the band tailing for efficient carrier transport

Nisika; Ghosh, A.; Kaur, K.; Yadav, M.K.; Bag, A.; Kumar, M. (2022-12-08)

Cu2ZnSnS4 (CZTS) absorber materials are often associated with high non-radiative recombination and band tailing which results in poor material properties. Herein, we successfully employ a small molecule, triethanolamine, ...
Progress and prospects of CZTSSe/CdS interface engineering to combat high open-circuit voltage deficit of kesterite photovoltaics: a critical review

Nisika; Kaur, K.; Kumar, M. (2020-12-11)

CZTSSe solar cells are considered to be potential and cost-effective alternative solutions to mature photovoltaic technology for meeting future energy demands. However, the current performance of CZTSSe solar cells is ...
Strain modulation for enhancing Cu–Zn ordering in CZTS absorber layer using seed layer assisted growth for efficient carrier transport

Kaur, K.; Ghosh, A.; Nisika; Kumar, M. (2021-07-19)

Cu2ZnSnS4 (CZTS) solar cells suffer from lower power conversion efficiency relative to its fellow copper indium gallium selenide thin-film technology, which have been asserted on the existence of non-stoichiometry and ...
Suppression of interfacial oxygen vacancies for efficient charge extraction at CZTS/TiO2 heterojunction

Nisika; Kaur, K.; Yadav, M. K.; Bag, A.; Kumar, M. (2021-07-25)

Earth abundant CZTS (Cu2ZnSnS4) absorber layers are promising for the development of cost-effective and large area photovoltaics; however, interfacial nonradiative recombination is a major obstruction to the pathways ...
Temporal-spatial-energy resolved advance multidimensional techniques to probe photovoltaic materials from atomistic viewpoint for next-generation energy solutions

Kumar, V.; Nisika; Kumar, M. (2021-11-15)

Solar cell technologies have attracted great attention considering their potential to meet the global energy demand in a sustainable fashion. There have been extensive research efforts to increase the efficiency of ...

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