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Your search keyword '"Yanagida, Masatoshi"' showing total 5 results
Start Over Author "Yanagida, Masatoshi" Publication Type Electronic Resources
5 results on '"Yanagida, Masatoshi"'

2. Concerted Ion Migration and Diffusion-Induced Degradation in Lead-Free Ag3BiI6 Rudorffite Solar Cells under Ambient Conditions

Author

Kulkarni, Ashish, Unlu, Feray, Pant, Namrata, Kaur, Jagjit, Bohr, Christoph, Jena, Ajay Kumar, oz, Senol, Yanagida, Masatoshi, Shirai, Yasuhiro, Ikegami, Masashi, Miyano, Kenjiro, Tachibana, Yasuhiro, Chakraborty, Sudip, Mathur, Sanjay, Miyasaka, Tsutomu, Kulkarni, Ashish, Unlu, Feray, Pant, Namrata, Kaur, Jagjit, Bohr, Christoph, Jena, Ajay Kumar, oz, Senol, Yanagida, Masatoshi, Shirai, Yasuhiro, Ikegami, Masashi, Miyano, Kenjiro, Tachibana, Yasuhiro, Chakraborty, Sudip, Mathur, Sanjay, and Miyasaka, Tsutomu

Abstract

Silver bismuth iodide (SBI) materials have recently gained attention as nontoxic alternatives to lead perovskites. Although most of the studies have been focusing on photovoltaic performance, the inherent ionic nature of SBI materials, their diffusive behavior, and influence on material/device stability is underexplored. Herein, AgBi2I7, Ag2BiI5, and Ag3BiI6 thin films are developed in controlled ambient humidity conditions with a decent efficiency up to 2.32%. While exploring the device stability, it is found that Ag3BiI6 exhibits a unique ion-migration behavior where Ag+, Bi3+, and I- ions migrate and diffuse through the dopant-free hole transport layer (HTL) leading to degradation. Interestingly, this ion-migration behavior is relatively fast for the case of antisolvent-processed Ag3BiI6 thin-film-based devices contrasting the case of without antisolvent and is not observed for other SBI material-based devices. Theoretical calculations suggest that low decomposition enthalpy favors the decomposition of Ag3BiI6 to AgI and BiI3 causing migration of ions to the electrode which is protected by using a thick HTL . The new mechanism reported herein underlines the importance of SBI material composition and fundamental mechanism understanding on the stability of Ag3BiI6 material for better solar cell design and also in extending the applications of unique ion-migration behavior in various optoelectronics.

Published
2021

4. Concerted Ion Migration and Diffusion-Induced Degradation in Lead-Free Ag3BiI6 Rudorffite Solar Cells under Ambient Conditions

Author

Kulkarni, Ashish, Unlu, Feray, Pant, Namrata, Kaur, Jagjit, Bohr, Christoph, Jena, Ajay Kumar, oz, Senol, Yanagida, Masatoshi, Shirai, Yasuhiro, Ikegami, Masashi, Miyano, Kenjiro, Tachibana, Yasuhiro, Chakraborty, Sudip, Mathur, Sanjay, Miyasaka, Tsutomu, Kulkarni, Ashish, Unlu, Feray, Pant, Namrata, Kaur, Jagjit, Bohr, Christoph, Jena, Ajay Kumar, oz, Senol, Yanagida, Masatoshi, Shirai, Yasuhiro, Ikegami, Masashi, Miyano, Kenjiro, Tachibana, Yasuhiro, Chakraborty, Sudip, Mathur, Sanjay, and Miyasaka, Tsutomu

Abstract

Silver bismuth iodide (SBI) materials have recently gained attention as nontoxic alternatives to lead perovskites. Although most of the studies have been focusing on photovoltaic performance, the inherent ionic nature of SBI materials, their diffusive behavior, and influence on material/device stability is underexplored. Herein, AgBi2I7, Ag2BiI5, and Ag3BiI6 thin films are developed in controlled ambient humidity conditions with a decent efficiency up to 2.32%. While exploring the device stability, it is found that Ag3BiI6 exhibits a unique ion-migration behavior where Ag+, Bi3+, and I- ions migrate and diffuse through the dopant-free hole transport layer (HTL) leading to degradation. Interestingly, this ion-migration behavior is relatively fast for the case of antisolvent-processed Ag3BiI6 thin-film-based devices contrasting the case of without antisolvent and is not observed for other SBI material-based devices. Theoretical calculations suggest that low decomposition enthalpy favors the decomposition of Ag3BiI6 to AgI and BiI3 causing migration of ions to the electrode which is protected by using a thick HTL . The new mechanism reported herein underlines the importance of SBI material composition and fundamental mechanism understanding on the stability of Ag3BiI6 material for better solar cell design and also in extending the applications of unique ion-migration behavior in various optoelectronics.

Published
2021

5. Colloidal Synthesis of Air-Stable Alloyed CsSn1–xPbxI3 Perovskite Nanocrystals for Use in Solar Cells

Author

Faculty of Informatics and Engineering, The University of Electro-Communications, Faculty of Life Science and Systems Engineering, Kyushu Institute of Technology, Faculty of Informatics and Engineering, The University of Electro-Communications, CREST, Japan Science and Technology Agency (JST), Faculty of Life Science and Systems Engineering, Kyushu Institute of Technology, CREST, Japan Science and Technology Agency (JST), Department of Electrical and Electronic Engineering, Faculty of Science and Engineering, Ritsumeikan University, CREST, Japan Science and Technology Agency (JST), Department of Electrical and Electronic Engineering, Miyazaki University,CREST, Japan Science and Technology Agency (JST), Beijing Key Laboratory of Novel Thin Film Solar Cells, State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources, North China Electric Power University, Center for Green Research on Energy and Environmental Materials, National Institute for Materials Science (NIMS), Global Research Center for Environmental and Energy Based on Nanomaterials Science, National Institute for Materials Science (NIMS), Liu, Feng, Ding, Chao, Zhang, Yaohong, Ripolles, Teresa S., Kamisaka, Taichi, Toyoda, Taro, Hayase, Shuzi, Minemoto, Takashi, Yoshino, Kenji, Dai, Songyuan, Yanagida, Masatoshi, Noguchi, Hidenori, Shen, Qing, Faculty of Informatics and Engineering, The University of Electro-Communications, Faculty of Life Science and Systems Engineering, Kyushu Institute of Technology, Faculty of Informatics and Engineering, The University of Electro-Communications, CREST, Japan Science and Technology Agency (JST), Faculty of Life Science and Systems Engineering, Kyushu Institute of Technology, CREST, Japan Science and Technology Agency (JST), Department of Electrical and Electronic Engineering, Faculty of Science and Engineering, Ritsumeikan University, CREST, Japan Science and Technology Agency (JST), Department of Electrical and Electronic Engineering, Miyazaki University,CREST, Japan Science and Technology Agency (JST), Beijing Key Laboratory of Novel Thin Film Solar Cells, State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources, North China Electric Power University, Center for Green Research on Energy and Environmental Materials, National Institute for Materials Science (NIMS), Global Research Center for Environmental and Energy Based on Nanomaterials Science, National Institute for Materials Science (NIMS), Liu, Feng, Ding, Chao, Zhang, Yaohong, Ripolles, Teresa S., Kamisaka, Taichi, Toyoda, Taro, Hayase, Shuzi, Minemoto, Takashi, Yoshino, Kenji, Dai, Songyuan, Yanagida, Masatoshi, Noguchi, Hidenori, and Shen, Qing

Abstract

type:Journal Article, Organic–inorganic hybrid perovskite solar cells have demonstrated unprecedented high power conversion efficiencies in the past few years. Now, the universal instability of the perovskites has become the main barrier for this kind of solar cells to realize commercialization. This situation can be even worse for those tin-based perovskites, especially for CsSnI3, because upon exposure to ambient atmosphere the desired black orthorhombic phase CsSnI3 would promptly lose single crystallinity and degrade to the inactive yellow phase, followed by irreversible oxidation into metallic Cs2SnI6. By alloying CsSnI3 with CsPbI3, we herein report the synthesis of alloyed perovskite quantum dot (QD), CsSn1–xPbxI3, which not only can be phase-stable for months in purified colloidal solution but also remains intact even directly exposed to ambient air, far superior to both of its parent CsSnI3 and CsPbI3 QDs. Ultrafast transient absorption spectroscopy studies reveal that the photoexcited electrons in the alloyed QDs can be injected into TiO2 nanocrystals at a fast rate of 1.12 × 1011 s–1, which enables a high photocurrent generation in solar cells.

Published
2018

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