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Zhu, Huimin
Publications (3 of 3) Show all publications
Zhu, H. (2019). Lead-free Metal Halide based Solar Cells. (Doctoral dissertation). Uppsala: Acta Universitatis Upsaliensis
Open this publication in new window or tab >>Lead-free Metal Halide based Solar Cells
2019 (English)Doctoral thesis, comprehensive summary (Other academic)
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.

Place, publisher, year, edition, pages
Uppsala: Acta Universitatis Upsaliensis, 2019. p. 79
Series
Digital Comprehensive Summaries of Uppsala Dissertations from the Faculty of Science and Technology, ISSN 1651-6214 ; 1840
Keywords
Low-toxicity, emerging light harvesters, lead-free, low toxic bismuth, Ag (Cs)-Bi (Sb)-I (Br) systems, 2D perovskites.
National Category
Physical Chemistry
Identifiers
urn:nbn:se:uu:diva-391058 (URN)978-91-513-0722-0 (ISBN)
Public defence
2019-10-04, Polhemsalen, Ångstrom 10134, Ångströmlaboratoriet, Lägerhyddsvägen 1, Uppsala, 10:15 (English)
Opponent
Supervisors
Available from: 2019-09-12 Created: 2019-08-18 Last updated: 2019-09-12Bibliographically approved
Zhu, H., Johansson, M. B. & Johansson, E. M. .. (2018). The Effect of Dopant-Free Hole-Transport Polymers on Charge Generation and Recombination in Cesium-Bismuth-Iodide Solar Cells. ChemSusChem, 11(6), 1114-1120
Open this publication in new window or tab >>The Effect of Dopant-Free Hole-Transport Polymers on Charge Generation and Recombination in Cesium-Bismuth-Iodide Solar Cells
2018 (English)In: ChemSusChem, ISSN 1864-5631, E-ISSN 1864-564X, Vol. 11, no 6, p. 1114-1120Article in journal (Refereed) Published
Abstract [en]

The photovoltaic characteristics of CsBi3I10-based solar cells with three dopant-free hole-conducting polymers are investigated. The effect on charge generation and charge recombination in the solar cells using the different polymers is studied and the results indicate that the choice of polymer strongly affects the device properties. Interestingly, for the solar cell with poly[[2,3-bis(3-octyloxyphenyl)-5,8-quinoxalinediyl]-2,5-thiophenediyl] (TQ1), the photon-to-current conversion spectrum is highly improved in the red wavelength region, suggesting that the polymer also contributes to the photocurrent generation in this case. This report provides a new direction for further optimization of Bi-halide solar cells by using dopant-free hole-transporting polymers and shows that the energy levels and the interaction between the Bi-halide and the conducting polymers are very important for solar cell performance.

Place, publisher, year, edition, pages
Wiley-VCH Verlagsgesellschaft, 2018
Keywords
bismuth, cesium bismuth iodide, htm, polymer, solar cells
National Category
Physical Chemistry
Identifiers
urn:nbn:se:uu:diva-354358 (URN)10.1002/cssc.201702169 (DOI)000428315300015 ()29372625 (PubMedID)
Funder
Swedish Energy AgencySwedish Research CouncilSwedish Research Council Formas
Available from: 2018-06-28 Created: 2018-06-28 Last updated: 2019-09-04Bibliographically approved
Johansson, M. B., Philippe, B., Banerjee, A., Phuyal, D., Chakraborty, S., Cameau, M., . . . Johansson, E. M. J.Cesium bismuth iodide, CsxBiyIz, solar cell compounds from systematic molar ratio variation.
Open this publication in new window or tab >>Cesium bismuth iodide, CsxBiyIz, solar cell compounds from systematic molar ratio variation
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(English)Manuscript (preprint) (Other academic)
National Category
Condensed Matter Physics
Identifiers
urn:nbn:se:uu:diva-369694 (URN)
Available from: 2018-12-16 Created: 2018-12-16 Last updated: 2018-12-19
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