MRS Meetings and Events

 

EQ04.02.03 2022 MRS Fall Meeting

Impact of Cation Disorder on Solar Cell Performance in Ternary Chalcogenides (I-III-S2; NaBiS2)

When and Where

Nov 28, 2022
2:15pm - 2:30pm

Sheraton, 2nd Floor, Constitution A

Presenter

Co-Author(s)

Seán Kavanagh1,Yi-Teng Huang2,Robert Hoye3,David Scanlon4,Aron Walsh3

University College London & Imperial College London1,University of Cambridge2,Imperial College London3,University College London4

Abstract

Seán Kavanagh1,Yi-Teng Huang2,Robert Hoye3,David Scanlon4,Aron Walsh3

University College London & Imperial College London1,University of Cambridge2,Imperial College London3,University College London4
I-V-VI<sub>2</sub> ternary chalcogenides have recently attracted growing attention as earth-abundant, nontoxic, and air-stable absorbers for photovoltaic applications.<sup>1</sup> In particular, our recent work on the NaBiS<sub>2</sub> & AgBiS<sub>2</sub> members of this family has revealed ultra-strong optical absorption for these compounds – <i>the highest of all current PV materials</i>.<sup>2</sup><i><sup>,3</sup></i> A key benefit of such intense light absorption is that it allows for ultrathin (&lt;100 nm) solar cell devices, dramatically reducing material consumption, weight and manufacturing demand, directly lowering the cost and facilitating applications in space for example, in addition to benefitting quantum efficiency and photovoltaic (PV) performance.<br/>Our work on AgBiS<sub>2</sub><sup>2</sup> showed the crucial importance of controlling cation distribution and disorder in these materials, yielding record-breaking efficiencies &gt;9% – the highest of any Bi-based solar absorber.<sup>2</sup> However, the impact of disorder on the charge-carrier properties in these materials is remains poorly understood. Herein, we investigate the key properties which dictate the relationship between disorder on the cation sublattice and carrier transport in these materials. We find the band-edge orbital character to be a crucial factor in the sensitivity of carrier localisation (and thus solar cell efficiency) to cation disorder, resulting in ultra-fast carrier trapping, despite slow carrier recombination, in NaBiS<sub>2</sub>.<i><sup>3</sup></i><br/>This work reveals the critical role of cation disorder in the photovoltaic performance of these systems, alongside key considerations for future research in this area.<br/><br/>(1) Huang, Y.-T.; Kavanagh, S. R.; Scanlon, D. O.; Walsh, A.; Hoye, R. L. Z. Perovskite-Inspired Materials for Photovoltaics and beyond—from Design to Devices. <i>Nanotechnology</i> <b>2021</b>, <i>32</i> (13), 132004. https://doi.org/10.1088/1361-6528/abcf6d.<br/>(2) Wang, Y.<sup> ‡</sup> & Kavanagh, S. R.<sup>‡</sup>; Burgués-Ceballos, I.; Walsh, A.; Scanlon, D. O.; Konstantatos, G. Cation Disorder Engineering Yields AgBiS2 Nanocrystals with Enhanced Optical Absorption for Efficient Ultrathin Solar Cells. <i>Nature Photonics</i> <b>2022</b>.<br/>(3) Huang, Y.-T.<sup> ‡</sup>; Kavanagh S. R.<sup> ‡</sup>; . R.; Scanlon, D. O.; Walsh, A.; Hoye, R. L. Z. et al. Strong Absorption and Ultrafast Localisation in NaBiS<sub>2</sub> Nanocrystals with Slow Charge-Carrier Recombination. <i>Nature Communications </i>(under review)

Keywords

chemical composition | combinatorial | defects

Symposium Organizers

Rafael Jaramillo, Massachusetts Institute of Technology
Archana Raja, Lawrence Berkeley National Laboratory
Jayakanth Ravichandran, University of Southern California
Akshay Singh, Indian Institute of Science, Bengaluru

Symposium Support

Silver
SEMILAB

Bronze
Lake Shore Cryotronics
Micro Photonics
SPECS Surface Nano Analysis GmbH

Publishing Alliance

MRS publishes with Springer Nature