Band-Like Charge Transport in Cs2AgBiBr6 and Mixed Antimony-Bismuth Cs2AgBi1- xSbxBr6 Halide Double Perovskites

Eline M. Hutter; María C. Gélvez-Rueda; Davide Bartesaghi; Ferdinand C. Grozema; Tom J. Savenije

doi:10.1021/acsomega.8b01705

Band-Like Charge Transport in Cs₂AgBiBr₆ and Mixed Antimony-Bismuth Cs₂AgBi_{1- x}Sb_xBr₆ Halide Double Perovskites

Eline M. Hutter^*
, María C. Gélvez-Rueda
, Davide Bartesaghi
, Ferdinand C. Grozema
, Tom J. Savenije

^*Corresponding author for this work

Delft University of Technology
extern

Research output: Contribution to journal › Article › Academic › peer-review

Abstract

Recently, halide double perovskites (HDPs), such as Cs₂AgBiBr₆, have been reported as promising nontoxic alternatives to lead halide perovskites. However, it remains unclear whether the charge-transport properties of these materials are as favorable as for lead-based perovskites. In this work, we study the mobilities of charges in Cs₂AgBiBr₆ and in mixed antimony-bismuth Cs₂AgBi_1-xSb_xBr₆, in which the band gap is tunable from 2.0 to 1.6 eV. Using temperature-dependent time-resolved microwave conductivity techniques, we find that the mobility is proportional to T^-p (with p ≈ 1.5). Importantly, this indicates that phonon scattering is the dominant scattering mechanism determining the charge carrier mobility in these HDPs similar to the state-of-the-art lead-based perovskites. Finally, we show that wet chemical processing of Cs₂AgBi_1-xSb_xBr₆ powders is a successful route to prepare thin films of these materials, which paves the way toward photovoltaic devices based on nontoxic HDPs with tunable band gaps.

Original language	English
Pages (from-to)	11655-11662
Number of pages	8
Journal	ACS Omega
Volume	3
Issue number	9
DOIs	https://doi.org/10.1021/acsomega.8b01705
Publication status	Published - 30 Sept 2018
Externally published	Yes

Funding

Hemamala Karunadasa is acknowledged for facilitating this project and for critical reading of this manuscript. The authors thank Adam Slavney for fruitful discussions. This work was supported by the Netherlands Organization for Scientific Research (NWO) under the Echo grant number: 712.014.007. E.M.H. received additional funding via a Fulbright Scholarship. Work by D.B. was funded by the Partnership Program of the Materials Innovation Institute M2i and the Foundation of Fundamental Research on Matter, Netherlands Organization for Scientific Research (F71.4.15562a).

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SDG 7 Affordable and Clean Energy

Access to Document

10.1021/acsomega.8b01705

Cite this

@article{bfa9857a770e4427a79c5561faf83493,

title = "Band-Like Charge Transport in Cs2AgBiBr6 and Mixed Antimony-Bismuth Cs2AgBi1- xSbxBr6 Halide Double Perovskites",

abstract = "Recently, halide double perovskites (HDPs), such as Cs2AgBiBr6, have been reported as promising nontoxic alternatives to lead halide perovskites. However, it remains unclear whether the charge-transport properties of these materials are as favorable as for lead-based perovskites. In this work, we study the mobilities of charges in Cs2AgBiBr6 and in mixed antimony-bismuth Cs2AgBi1-xSbxBr6, in which the band gap is tunable from 2.0 to 1.6 eV. Using temperature-dependent time-resolved microwave conductivity techniques, we find that the mobility is proportional to T-p (with p ≈ 1.5). Importantly, this indicates that phonon scattering is the dominant scattering mechanism determining the charge carrier mobility in these HDPs similar to the state-of-the-art lead-based perovskites. Finally, we show that wet chemical processing of Cs2AgBi1-xSbxBr6 powders is a successful route to prepare thin films of these materials, which paves the way toward photovoltaic devices based on nontoxic HDPs with tunable band gaps.",

author = "Hutter, \{Eline M.\} and G{\'e}lvez-Rueda, \{Mar{\'i}a C.\} and Davide Bartesaghi and Grozema, \{Ferdinand C.\} and Savenije, \{Tom J.\}",

year = "2018",

month = sep,

day = "30",

doi = "10.1021/acsomega.8b01705",

language = "English",

volume = "3",

pages = "11655--11662",

journal = "ACS Omega",

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T1 - Band-Like Charge Transport in Cs2AgBiBr6 and Mixed Antimony-Bismuth Cs2AgBi1- xSbxBr6 Halide Double Perovskites

AU - Hutter, Eline M.

AU - Gélvez-Rueda, María C.

AU - Bartesaghi, Davide

AU - Grozema, Ferdinand C.

AU - Savenije, Tom J.

PY - 2018/9/30

Y1 - 2018/9/30

N2 - Recently, halide double perovskites (HDPs), such as Cs2AgBiBr6, have been reported as promising nontoxic alternatives to lead halide perovskites. However, it remains unclear whether the charge-transport properties of these materials are as favorable as for lead-based perovskites. In this work, we study the mobilities of charges in Cs2AgBiBr6 and in mixed antimony-bismuth Cs2AgBi1-xSbxBr6, in which the band gap is tunable from 2.0 to 1.6 eV. Using temperature-dependent time-resolved microwave conductivity techniques, we find that the mobility is proportional to T-p (with p ≈ 1.5). Importantly, this indicates that phonon scattering is the dominant scattering mechanism determining the charge carrier mobility in these HDPs similar to the state-of-the-art lead-based perovskites. Finally, we show that wet chemical processing of Cs2AgBi1-xSbxBr6 powders is a successful route to prepare thin films of these materials, which paves the way toward photovoltaic devices based on nontoxic HDPs with tunable band gaps.

AB - Recently, halide double perovskites (HDPs), such as Cs2AgBiBr6, have been reported as promising nontoxic alternatives to lead halide perovskites. However, it remains unclear whether the charge-transport properties of these materials are as favorable as for lead-based perovskites. In this work, we study the mobilities of charges in Cs2AgBiBr6 and in mixed antimony-bismuth Cs2AgBi1-xSbxBr6, in which the band gap is tunable from 2.0 to 1.6 eV. Using temperature-dependent time-resolved microwave conductivity techniques, we find that the mobility is proportional to T-p (with p ≈ 1.5). Importantly, this indicates that phonon scattering is the dominant scattering mechanism determining the charge carrier mobility in these HDPs similar to the state-of-the-art lead-based perovskites. Finally, we show that wet chemical processing of Cs2AgBi1-xSbxBr6 powders is a successful route to prepare thin films of these materials, which paves the way toward photovoltaic devices based on nontoxic HDPs with tunable band gaps.

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