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Bandgap Tuning of Silver Bismuth Iodide via Controllable Bromide Substitution for Improved Photovoltaic Performance
Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Kemiska sektionen, Institutionen för kemi - Ångström. ilin Univ, State Key Lab Integrated Optoelect, Changchun 130012, Jilin, Peoples R China;Jilin Univ, Coll Elect Sci & Engn, Changchun 130012, Jilin, Peoples R China.
Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Kemiska sektionen, Institutionen för kemi - Ångström, Fysikalisk kemi.
Stockholm Univ, Alballova Univ Ctr, Dept Phys, S-10691 Stockholm, Sweden.
Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Tekniska sektionen, Institutionen för teknikvetenskaper, Fasta tillståndets fysik. Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Kemiska sektionen, Institutionen för kemi - Ångström, Fysikalisk kemi.ORCID-id: 0000-0003-2046-1229
Vise andre og tillknytning
2019 (engelsk)Inngår i: ACS APPLIED ENERGY MATERIALSArtikkel i tidsskrift (Fagfellevurdert) Accepted
Abstract [en]

In this work, silver-bismuth-halide thin films, exhibiting low toxicity and good stability, were explored systemically by gradually substituting iodide, I, with bromide, Br, in the AgBi2I7 system. It was found that the optical bandgap can be tuned by varying the I/Br ratio. Moreover, the film quality was improved when introducing a small amount of Br. The solar cell was demonstrated to be more stable at ambient conditions and most efficient when incorporating 10% Br, as a result of decreased recombination originating from the increased grain size. Thus, replacing a small amount of I with Br was beneficial for photovoltaic performance.

sted, utgiver, år, opplag, sider
American Chemical Society (ACS), 2019.
Emneord [en]
lead-free solar cells, power conversion efficiency, bandgap, silver bismuth iodide, mixed-halide composition, grain size, density functional theory
HSV kategori
Identifikatorer
URN: urn:nbn:se:uu:diva-391056DOI: 10.1021/acsaem.9b00914ISI: 000483434700003OAI: oai:DiVA.org:uu-391056DiVA, id: diva2:1343603
Forskningsfinansiär
Swedish Research CouncilSwedish Energy AgencyTilgjengelig fra: 2019-08-18 Laget: 2019-08-18 Sist oppdatert: 2019-10-09bibliografisk kontrollert
Inngår i avhandling
1. Lead-free Metal Halide based Solar Cells
Åpne denne publikasjonen i ny fane eller vindu >>Lead-free Metal Halide based Solar Cells
2019 (engelsk)Doktoravhandling, med artikler (Annet vitenskapelig)
Abstract [en]

Lead-halide perovskites have recently appeared as very promising materials for solar cells. However, their stability and toxicity may be limiting factors for their application. Therefore, to find new low toxic and high stability light harvesters may be necessary for overcoming the challenges of perovskite solar cells. The overall aim of this thesis is to explore new low toxic light harvesters and to investigate their possibility for application of solar cells. The focus in the thesis is on bismuth halide-based light harvesters, which show high light absorption coefficient and promising photovoltaic performance. Specifically, the investigated materials are different compositions of metal halides in which silver, Ag or cesium, Cs, are combined with bismuth, Bi, or antimony, Sb and the halides iodide, I, or bromide, Br. All of the systems show very promising optical performances, however, their photovoltaic performances are still low, which is partially due to the recombination and defects issues, etc. Through adjusting the elemental compositions by mixing Bi/Sb or I/Br the optical properties were tuned. By varying fabrication conditions or devices architectures, the results in this thesis also show that all the low toxic light harvesters works in solar cells, which possibly can be utilized in future photovoltaics.

sted, utgiver, år, opplag, sider
Uppsala: Acta Universitatis Upsaliensis, 2019. s. 79
Serie
Digital Comprehensive Summaries of Uppsala Dissertations from the Faculty of Science and Technology, ISSN 1651-6214 ; 1840
Emneord
Low-toxicity, emerging light harvesters, lead-free, low toxic bismuth, Ag (Cs)-Bi (Sb)-I (Br) systems, 2D perovskites.
HSV kategori
Identifikatorer
urn:nbn:se:uu:diva-391058 (URN)978-91-513-0722-0 (ISBN)
Disputas
2019-10-04, Polhemsalen, Ångstrom 10134, Ångströmlaboratoriet, Lägerhyddsvägen 1, Uppsala, 10:15 (engelsk)
Opponent
Veileder
Tilgjengelig fra: 2019-09-12 Laget: 2019-08-18 Sist oppdatert: 2019-10-15bibliografisk kontrollert

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