Guanidium-assisted crystallization engineering for highly efficient CsPbI3 solar cells

Shuo  Wang; Youkui  Xu; Qian Wang; Xufeng  Zhou; ZhenHua  Li; Meng Wang; Yutian  Lei; Hong  Zhang; Haoxu Wang; Zhiwen  Jin

doi:10.1039/d2tc01008a

Guanidium-assisted crystallization engineering for highly efficient CsPbI₃ solar cells

Shuo Wang, Youkui Xu, Qian Wang^*, Xufeng Zhou, ZhenHua Li^*, Meng Wang, Yutian Lei, Hong Zhang, Haoxu Wang, Zhiwen Jin

^*Corresponding author for this work

Photovoltaic Materials and Devices

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

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Abstract

Iodine vacancies and uncoordinated iodide ions of CsPbI₃ films are mainly responsible for nonradiative recombination. Here, we report a composition-engineering passivation method that through guanidium (GA⁺) and I⁻ forms strong hydrogen bonds to passivate iodine vacancies and reduce defects. Both experimental and theoretical results confirmed strong chemical interactions between GA⁺ and uncoordinated I⁻ in the GA_xCs_1−xPbI₃ bulk or at the grain boundary. Moreover, GA⁺ doping could slow down the crystallization speed of perovskite films during the deposition process. As a result, we observed GA⁺ modified films with much lower defect density, larger grain size, and better carrier extraction and transportation. Upon GA⁺ passivation, the power conversion efficiency (PCE) is boosted from 18.01% to 19.05%, with open-circuit voltage (V_OC) enhancement from 1.08 V to 1.14 V.

Original language	English
Pages (from-to)	8234-8240
Number of pages	7
Journal	Journal of Materials Chemistry C
Volume	10
Issue number	21
DOIs	https://doi.org/10.1039/d2tc01008a
Publication status	Published - 2022

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Green Open Access added to TU Delft Institutional Repository 'You share, we take care!' - Taverne project https://www.openaccess.nl/en/you-share-we-take-care

Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.

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title = "Guanidium-assisted crystallization engineering for highly efficient CsPbI3 solar cells",

abstract = "Iodine vacancies and uncoordinated iodide ions of CsPbI3 films are mainly responsible for nonradiative recombination. Here, we report a composition-engineering passivation method that through guanidium (GA+) and I− forms strong hydrogen bonds to passivate iodine vacancies and reduce defects. Both experimental and theoretical results confirmed strong chemical interactions between GA+ and uncoordinated I− in the GAxCs1−xPbI3 bulk or at the grain boundary. Moreover, GA+ doping could slow down the crystallization speed of perovskite films during the deposition process. As a result, we observed GA+ modified films with much lower defect density, larger grain size, and better carrier extraction and transportation. Upon GA+ passivation, the power conversion efficiency (PCE) is boosted from 18.01% to 19.05%, with open-circuit voltage (VOC) enhancement from 1.08 V to 1.14 V.",

author = "Shuo Wang and Youkui Xu and Qian Wang and Xufeng Zhou and ZhenHua Li and Meng Wang and Yutian Lei and Hong Zhang and Haoxu Wang and Zhiwen Jin",

note = "Green Open Access added to TU Delft Institutional Repository 'You share, we take care!' - Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.",

year = "2022",

doi = "10.1039/d2tc01008a",

language = "English",

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pages = "8234--8240",

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TY - JOUR

T1 - Guanidium-assisted crystallization engineering for highly efficient CsPbI3 solar cells

AU - Wang, Shuo

AU - Xu, Youkui

AU - Wang, Qian

AU - Zhou, Xufeng

AU - Li, ZhenHua

AU - Wang, Meng

AU - Lei, Yutian

AU - Zhang, Hong

AU - Wang, Haoxu

AU - Jin, Zhiwen

N1 - Green Open Access added to TU Delft Institutional Repository 'You share, we take care!' - Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.

PY - 2022

Y1 - 2022

N2 - Iodine vacancies and uncoordinated iodide ions of CsPbI3 films are mainly responsible for nonradiative recombination. Here, we report a composition-engineering passivation method that through guanidium (GA+) and I− forms strong hydrogen bonds to passivate iodine vacancies and reduce defects. Both experimental and theoretical results confirmed strong chemical interactions between GA+ and uncoordinated I− in the GAxCs1−xPbI3 bulk or at the grain boundary. Moreover, GA+ doping could slow down the crystallization speed of perovskite films during the deposition process. As a result, we observed GA+ modified films with much lower defect density, larger grain size, and better carrier extraction and transportation. Upon GA+ passivation, the power conversion efficiency (PCE) is boosted from 18.01% to 19.05%, with open-circuit voltage (VOC) enhancement from 1.08 V to 1.14 V.

AB - Iodine vacancies and uncoordinated iodide ions of CsPbI3 films are mainly responsible for nonradiative recombination. Here, we report a composition-engineering passivation method that through guanidium (GA+) and I− forms strong hydrogen bonds to passivate iodine vacancies and reduce defects. Both experimental and theoretical results confirmed strong chemical interactions between GA+ and uncoordinated I− in the GAxCs1−xPbI3 bulk or at the grain boundary. Moreover, GA+ doping could slow down the crystallization speed of perovskite films during the deposition process. As a result, we observed GA+ modified films with much lower defect density, larger grain size, and better carrier extraction and transportation. Upon GA+ passivation, the power conversion efficiency (PCE) is boosted from 18.01% to 19.05%, with open-circuit voltage (VOC) enhancement from 1.08 V to 1.14 V.

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U2 - 10.1039/d2tc01008a

DO - 10.1039/d2tc01008a

M3 - Article

AN - SCOPUS:85133154461

SN - 2050-7526

VL - 10

SP - 8234

EP - 8240

JO - Journal of Materials Chemistry C

JF - Journal of Materials Chemistry C

IS - 21

ER -

Guanidium-assisted crystallization engineering for highly efficient CsPbI₃ solar cells

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