Efficiency enhancement by defect engineering in perovskite photovoltaic cells prepared using evaporated PbI2/CH3NH3I multilayers

Annie Ng; Zhiwei Ren; Qian Shen; Sin Hang Cheung; Huseyin Cem Gokkaya; Gongxun Bai; Jingchuan Wang; Lijun Yang; Shu Kong So; Aleksandra B. Djurišić; Wallace Woon-fong Leung; Jianhua Hao; Wai Kin Chan; Charles Surya

doi:10.1039/c4ta05070c

Efficiency enhancement by defect engineering in perovskite photovoltaic cells prepared using evaporated PbI₂/CH₃NH₃I multilayers

Annie Ng, Zhiwei Ren, Qian Shen, Sin Hang Cheung, Huseyin Cem Gokkaya, Gongxun Bai, Jingchuan Wang, Lijun Yang, Shu Kong So, Aleksandra B. Djurišić, Wallace Woon-fong Leung, Jianhua Hao, Wai Kin Chan, Charles Surya^*

^*Corresponding author for this work

Department of Physics

Research output: Contribution to journal › Journal article › peer-review

86 Citations (Scopus)

Abstract

We report, for the first time, on the synthesis of perovskite films by thermal annealing of evaporated lead(ii) iodide (PbI₂)/methylammonium iodide (CH₃NH₃I) multilayers. Detailed characterization of the resulting films is presented. Our work demonstrates that compact, high quality and uniform perovskite films can be grown using this technique. Optimization of the device structure was achieved by careful design of the layer thickness and the number of PbI₂/CH₃NH₃I pairs used in the formation of the absorber layer. Utilizing additional annealing steps in a controlled atmosphere was shown to result in significant improvement in the device performance. Our experimental data indicate that O₂ treatments may result in substantial reduction in the trap density of the device and thereby significant improvement in the lifetimes of the carriers. A high power conversion efficiency (PCE) of 12.5% was recorded for the champion device.

Original language	English
Pages (from-to)	9223-9231
Number of pages	9
Journal	Journal of Materials Chemistry A
Volume	3
Issue number	17
Early online date	6 Jan 2015
DOIs	https://doi.org/10.1039/c4ta05070c
Publication status	Published - 7 May 2015

Scopus Subject Areas

Chemistry(all)
Renewable Energy, Sustainability and the Environment
Materials Science(all)

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10.1039/c4ta05070c

Cite this

Ng, A., Ren, Z., Shen, Q., Cheung, S. H., Gokkaya, H. C., Bai, G., Wang, J., Yang, L., So, S. K., Djurišić, A. B., Leung, W. W., Hao, J., Chan, W. K., & Surya, C. (2015). Efficiency enhancement by defect engineering in perovskite photovoltaic cells prepared using evaporated PbI₂/CH₃NH₃I multilayers. Journal of Materials Chemistry A, 3(17), 9223-9231. https://doi.org/10.1039/c4ta05070c

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title = "Efficiency enhancement by defect engineering in perovskite photovoltaic cells prepared using evaporated PbI2/CH3NH3I multilayers",

abstract = "We report, for the first time, on the synthesis of perovskite films by thermal annealing of evaporated lead(ii) iodide (PbI2)/methylammonium iodide (CH3NH3I) multilayers. Detailed characterization of the resulting films is presented. Our work demonstrates that compact, high quality and uniform perovskite films can be grown using this technique. Optimization of the device structure was achieved by careful design of the layer thickness and the number of PbI2/CH3NH3I pairs used in the formation of the absorber layer. Utilizing additional annealing steps in a controlled atmosphere was shown to result in significant improvement in the device performance. Our experimental data indicate that O2 treatments may result in substantial reduction in the trap density of the device and thereby significant improvement in the lifetimes of the carriers. A high power conversion efficiency (PCE) of 12.5% was recorded for the champion device.",

author = "Annie Ng and Zhiwei Ren and Qian Shen and Cheung, {Sin Hang} and Gokkaya, {Huseyin Cem} and Gongxun Bai and Jingchuan Wang and Lijun Yang and So, {Shu Kong} and Djuri{\v s}i{\'c}, {Aleksandra B.} and Leung, {Wallace Woon-fong} and Jianhua Hao and Chan, {Wai Kin} and Charles Surya",

note = "Funding information: This work was supported by the RGC Theme-based Research Scheme (Grant number: HKU T23-713/11). One of us (SKS) would like to acknowledge the RGC for the support of the PDS experiments through the GRF scheme (Grant number: HKBU211913). CS would like to acknowledge funding support from the Clarea Au Endowment Professorship. Publisher copyright: {\textcopyright} The Royal Society of Chemistry 2015",

year = "2015",

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doi = "10.1039/c4ta05070c",

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Ng, A, Ren, Z, Shen, Q, Cheung, SH, Gokkaya, HC, Bai, G, Wang, J, Yang, L, So, SK, Djurišić, AB, Leung, WW, Hao, J, Chan, WK & Surya, C 2015, 'Efficiency enhancement by defect engineering in perovskite photovoltaic cells prepared using evaporated PbI₂/CH₃NH₃I multilayers', Journal of Materials Chemistry A, vol. 3, no. 17, pp. 9223-9231. https://doi.org/10.1039/c4ta05070c

TY - JOUR

T1 - Efficiency enhancement by defect engineering in perovskite photovoltaic cells prepared using evaporated PbI2/CH3NH3I multilayers

AU - Ng, Annie

AU - Ren, Zhiwei

AU - Shen, Qian

AU - Cheung, Sin Hang

AU - Gokkaya, Huseyin Cem

AU - Bai, Gongxun

AU - Wang, Jingchuan

AU - Yang, Lijun

AU - So, Shu Kong

AU - Djurišić, Aleksandra B.

AU - Leung, Wallace Woon-fong

AU - Hao, Jianhua

AU - Chan, Wai Kin

AU - Surya, Charles

N1 - Funding information: This work was supported by the RGC Theme-based Research Scheme (Grant number: HKU T23-713/11). One of us (SKS) would like to acknowledge the RGC for the support of the PDS experiments through the GRF scheme (Grant number: HKBU211913). CS would like to acknowledge funding support from the Clarea Au Endowment Professorship. Publisher copyright: © The Royal Society of Chemistry 2015

PY - 2015/5/7

Y1 - 2015/5/7

N2 - We report, for the first time, on the synthesis of perovskite films by thermal annealing of evaporated lead(ii) iodide (PbI2)/methylammonium iodide (CH3NH3I) multilayers. Detailed characterization of the resulting films is presented. Our work demonstrates that compact, high quality and uniform perovskite films can be grown using this technique. Optimization of the device structure was achieved by careful design of the layer thickness and the number of PbI2/CH3NH3I pairs used in the formation of the absorber layer. Utilizing additional annealing steps in a controlled atmosphere was shown to result in significant improvement in the device performance. Our experimental data indicate that O2 treatments may result in substantial reduction in the trap density of the device and thereby significant improvement in the lifetimes of the carriers. A high power conversion efficiency (PCE) of 12.5% was recorded for the champion device.

AB - We report, for the first time, on the synthesis of perovskite films by thermal annealing of evaporated lead(ii) iodide (PbI2)/methylammonium iodide (CH3NH3I) multilayers. Detailed characterization of the resulting films is presented. Our work demonstrates that compact, high quality and uniform perovskite films can be grown using this technique. Optimization of the device structure was achieved by careful design of the layer thickness and the number of PbI2/CH3NH3I pairs used in the formation of the absorber layer. Utilizing additional annealing steps in a controlled atmosphere was shown to result in significant improvement in the device performance. Our experimental data indicate that O2 treatments may result in substantial reduction in the trap density of the device and thereby significant improvement in the lifetimes of the carriers. A high power conversion efficiency (PCE) of 12.5% was recorded for the champion device.

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JO - Journal of Materials Chemistry A

JF - Journal of Materials Chemistry A

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