Conjugated Polymer–Assisted Grain Boundary Passivation for Efficient Inverted Planar Perovskite Solar Cells

Wei Chen; Yingfeng Wang; Guotao Pang; Chang Woo Koh; Aleksandra B. Djurišić; Yinghui Wu; Bao Tu; Fang zhou Liu; Rui Chen; Han Young Woo; Xugang Guo; Zhubing He

doi:10.1002/adfm.201808855

Conjugated Polymer–Assisted Grain Boundary Passivation for Efficient Inverted Planar Perovskite Solar Cells

Wei Chen, Yingfeng Wang, Guotao Pang, Chang Woo Koh, Aleksandra B. Djurišić, Yinghui Wu, Bao Tu, Fang zhou Liu, Rui Chen, Han Young Woo, Xugang Guo, Zhubing He

Department of Chemistry

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

109 Citations (Scopus)

Abstract

Grain boundaries in lead halide perovskite films lead to increased recombination losses and decreased device stability under illumination due to defect-mediated ion migration. The effect of a conjugated polymer additive, poly(bithiophene imide) (PBTI), is investigated in the antisolvent treatment step in the perovskite film deposition by comprehensive characterization of perovskite film properties and the performance of inverted planar perovskite solar cells (PSCs). PBTI is found to be incorporated within grain boundaries, which results in an improvement in perovskite film crystallinity and reduced defects. The successful defect passivation by PBTI yields reduces recombination losses and consequently increases power conversion efficiency (PCE). In addition, it gives rise to improved photoluminescence stability and improved PSC stability under illumination which can be attributed to reduced ion migration. The optimal devices exhibit a PCE of 20.67% compared to 18.89% of control devices without PBTI, while they retain over 70% of the initial efficiency after 600 h under 1 sun illumination compared to 56% for the control devices.

Original language	English
Article number	1808855
Journal	Advanced Functional Materials
Volume	29
Issue number	27
DOIs	https://doi.org/10.1002/adfm.201808855
Publication status	Published - 2019 Jul 4

Keywords

conjugated polymers
grain boundary passivation
halide perovskites
nickel oxide

ASJC Scopus subject areas

Chemistry(all)
Materials Science(all)
Condensed Matter Physics

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@article{85b87553ff9c42cd8e1d49a5cb2b37ac,

title = "Conjugated Polymer–Assisted Grain Boundary Passivation for Efficient Inverted Planar Perovskite Solar Cells",

abstract = "Grain boundaries in lead halide perovskite films lead to increased recombination losses and decreased device stability under illumination due to defect-mediated ion migration. The effect of a conjugated polymer additive, poly(bithiophene imide) (PBTI), is investigated in the antisolvent treatment step in the perovskite film deposition by comprehensive characterization of perovskite film properties and the performance of inverted planar perovskite solar cells (PSCs). PBTI is found to be incorporated within grain boundaries, which results in an improvement in perovskite film crystallinity and reduced defects. The successful defect passivation by PBTI yields reduces recombination losses and consequently increases power conversion efficiency (PCE). In addition, it gives rise to improved photoluminescence stability and improved PSC stability under illumination which can be attributed to reduced ion migration. The optimal devices exhibit a PCE of 20.67% compared to 18.89% of control devices without PBTI, while they retain over 70% of the initial efficiency after 600 h under 1 sun illumination compared to 56% for the control devices.",

keywords = "conjugated polymers, grain boundary passivation, halide perovskites, nickel oxide",

author = "Wei Chen and Yingfeng Wang and Guotao Pang and Koh, {Chang Woo} and Djuri{\v s}i{\'c}, {Aleksandra B.} and Yinghui Wu and Bao Tu and Liu, {Fang zhou} and Rui Chen and Woo, {Han Young} and Xugang Guo and Zhubing He",

note = "Funding Information: W.C., Y.W. and G.P. contributed equally to this work. This work was supported by the National Natural Science Foundation of China (NSFC) (Nos. 61775091 and 51573076), National Key Research Project MOST (No. 2016YFA0202400), the Shenzhen Key Laboratory Project (No. ZDSYS201602261933302), and Natural Science Foundation of Shenzhen Innovation Committee (Nos. JCYJ20180504165851864, JCYJ20170818141216288, JCYJ20170817105905899). The authors are grateful for support from the Seed Funding for Strategic Interdisciplinary Research Scheme of the University of Hong Kong. RGC GRF grants 15204515 and 15246816 are also acknowledged. The authors thank the Materials Characterization and Preparation Center (MCPC) and the Pico Center of SUSTech for some characterizations in this work. Publisher Copyright: {\textcopyright} 2019 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim",

year = "2019",

month = jul,

day = "4",

doi = "10.1002/adfm.201808855",

language = "English",

volume = "29",

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TY - JOUR

T1 - Conjugated Polymer–Assisted Grain Boundary Passivation for Efficient Inverted Planar Perovskite Solar Cells

AU - Chen, Wei

AU - Wang, Yingfeng

AU - Pang, Guotao

AU - Koh, Chang Woo

AU - Djurišić, Aleksandra B.

AU - Wu, Yinghui

AU - Tu, Bao

AU - Liu, Fang zhou

AU - Chen, Rui

AU - Woo, Han Young

AU - Guo, Xugang

AU - He, Zhubing

N1 - Funding Information: W.C., Y.W. and G.P. contributed equally to this work. This work was supported by the National Natural Science Foundation of China (NSFC) (Nos. 61775091 and 51573076), National Key Research Project MOST (No. 2016YFA0202400), the Shenzhen Key Laboratory Project (No. ZDSYS201602261933302), and Natural Science Foundation of Shenzhen Innovation Committee (Nos. JCYJ20180504165851864, JCYJ20170818141216288, JCYJ20170817105905899). The authors are grateful for support from the Seed Funding for Strategic Interdisciplinary Research Scheme of the University of Hong Kong. RGC GRF grants 15204515 and 15246816 are also acknowledged. The authors thank the Materials Characterization and Preparation Center (MCPC) and the Pico Center of SUSTech for some characterizations in this work. Publisher Copyright: © 2019 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim

PY - 2019/7/4

Y1 - 2019/7/4

N2 - Grain boundaries in lead halide perovskite films lead to increased recombination losses and decreased device stability under illumination due to defect-mediated ion migration. The effect of a conjugated polymer additive, poly(bithiophene imide) (PBTI), is investigated in the antisolvent treatment step in the perovskite film deposition by comprehensive characterization of perovskite film properties and the performance of inverted planar perovskite solar cells (PSCs). PBTI is found to be incorporated within grain boundaries, which results in an improvement in perovskite film crystallinity and reduced defects. The successful defect passivation by PBTI yields reduces recombination losses and consequently increases power conversion efficiency (PCE). In addition, it gives rise to improved photoluminescence stability and improved PSC stability under illumination which can be attributed to reduced ion migration. The optimal devices exhibit a PCE of 20.67% compared to 18.89% of control devices without PBTI, while they retain over 70% of the initial efficiency after 600 h under 1 sun illumination compared to 56% for the control devices.

AB - Grain boundaries in lead halide perovskite films lead to increased recombination losses and decreased device stability under illumination due to defect-mediated ion migration. The effect of a conjugated polymer additive, poly(bithiophene imide) (PBTI), is investigated in the antisolvent treatment step in the perovskite film deposition by comprehensive characterization of perovskite film properties and the performance of inverted planar perovskite solar cells (PSCs). PBTI is found to be incorporated within grain boundaries, which results in an improvement in perovskite film crystallinity and reduced defects. The successful defect passivation by PBTI yields reduces recombination losses and consequently increases power conversion efficiency (PCE). In addition, it gives rise to improved photoluminescence stability and improved PSC stability under illumination which can be attributed to reduced ion migration. The optimal devices exhibit a PCE of 20.67% compared to 18.89% of control devices without PBTI, while they retain over 70% of the initial efficiency after 600 h under 1 sun illumination compared to 56% for the control devices.

KW - conjugated polymers

KW - grain boundary passivation

KW - halide perovskites

KW - nickel oxide

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U2 - 10.1002/adfm.201808855

DO - 10.1002/adfm.201808855

M3 - Article

AN - SCOPUS:85065223538

SN - 1616-301X

VL - 29

JO - Advanced Functional Materials

JF - Advanced Functional Materials

IS - 27

M1 - 1808855

ER -

Conjugated Polymer–Assisted Grain Boundary Passivation for Efficient Inverted Planar Perovskite Solar Cells

Abstract

Keywords

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