GeI₂ Additive for High Optoelectronic Quality CsPbI₃ Quantum Dots and Their Application in Photovoltaic Devices Article Swipe

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Feng Liu , Chao Ding , Yaohong Zhang , Taichi Kamisaka , Qian Zhao , Joseph M. Luther , Taro Toyoda , Shuzi Hayase , Takashi Minemoto , Kenji Yoshino , Bing Zhang , Songyuan Dai , Junke Jiang , Shuxia Tao , Qing Shen ·

YOU? · · 2019 · Open Access · · DOI: https://doi.org/10.1021/acs.chemmater.8b03871

Trioctylphosphine (TOP)-based syntheses of CsPbI₃ perovskite quantum dots (QDs) yield unprecedented high photoluminescence quantum yield (PL QY), lower Stokes shifts, and longer carrier lifetimes due to their enhanced crystallinity. This synthetic route relies on a heavily Pb-rich condition or a large Pb:Cs molar ratio in precursor solution to produce QDs with appropriate stoichiometry as well as to guarantee a good colloidal stability. The high Pb condition is achieved by a high concentration of PbI₂ prepared in TOP. Here we find such Pb-rich strategies can be avoided by providing additional iodine ions using other metal halide salts. In particular GeI₂, which contrary to PbI₂, readily dissolves in TOP. CsPbI₃ QDs prepared using PbI₂/GeI₂ combination show near-unity PL QY and improved chemical stability compared to the previous synthetic route. Furthermore, we find no sign of Ge incorporation in the QDs (compositionally or energetically). The ensuing QD solar cells deliver power conversion efficiency of 12.15% and retain 85% of its peak performance after storage over 90 days. The PbI₂/GeI₂ dual-source iodine synthetic approach presented here represents a more rational and robust route to high-quality CsPbI₃ QDs. to guarantee a good colloidal stability. The high Pb condition is achieved by a high concentration of PbI2 prepared in TOP. Here we find such Pb-rich strategies can be avoided by providing additional iodine ions using other metal halide salts. In particular GeI₂, which contrary to PbI₂, readily dissolves in TOP. CsPbI₃ QDs prepared using PbI₂/GeI₂ combination show near-unity PL QY and improved chemical stability compared to the previous synthetic route. Furthermore, we find no sign of Ge incorporation in the QDs (compositionally or energetically). The ensuing QD solar cells deliver power conversion efficiency of 12.15% and retain 85% of its peak performance after storage over 90 days. The PbI₂/GeI₂ dual-source iodine synthetic approach presented here represents a more rational and robust route to high-quality CsPbI₃ QDs.

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Perovskite (Structure)

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Quantum dot Quantum yield Photoluminescence Crystallinity Materials science Stoichiometry Halide Photovoltaic system Yield (engineering) Molar ratio Energy conversion efficiency Nanocrystal Perovskite (structure) Optoelectronics Nanotechnology Chemistry Inorganic chemistry Physical chemistry Crystallography Catalysis Organic chemistry Physics Optics Metallurgy Composite material Biology Ecology Fluorescence

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Type: article
Language: en
Landing Page: https://doi.org/10.1021/acs.chemmater.8b03871
OA Status: green
Cited By: 129
References: 58
Related Works: 10
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DOI: https://doi.org/10.1021/acs.chemmater.8b03871

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Title: GeI₂ Additive for High Optoelectronic Quality CsPbI₃ Quantum Dots and Their Application in Photovoltaic Devices

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Language: en

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Publication year: 2019

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Publication date: 2019-01-14

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Authors: Feng Liu, Chao Ding, Yaohong Zhang, Taichi Kamisaka, Qian Zhao, Joseph M. Luther, Taro Toyoda, Shuzi Hayase, Takashi Minemoto, Kenji Yoshino, Bing Zhang, Songyuan Dai, Junke Jiang, Shuxia Tao, Qing Shen

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Concepts: Quantum dot, Quantum yield, Photoluminescence, Crystallinity, Materials science, Stoichiometry, Halide, Photovoltaic system, Yield (engineering), Molar ratio, Energy conversion efficiency, Nanocrystal, Perovskite (structure), Optoelectronics, Nanotechnology, Chemistry, Inorganic chemistry, Physical chemistry, Crystallography, Catalysis, Organic chemistry, Physics, Optics, Metallurgy, Composite material, Biology, Ecology, Fluorescence

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Cited by: 129

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GeI2 Additive for High Optoelectronic Quality CsPbI3 Quantum Dots and Their Application in Photovoltaic Devices Article Swipe

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GeI₂ Additive for High Optoelectronic Quality CsPbI₃ Quantum Dots and Their Application in Photovoltaic Devices Article Swipe