2020 Fiscal Year Research-status Report
Developing novel p-type BiOX oxyhalides thin layer for stable and efficient CsPbI3 perovskite solar cells
| Project/Area Number |
20K15385
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| Research Institution | Toin University of Yokohama |
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Principal Investigator |
郭 章林 桐蔭横浜大学, 工学研究科, 特任研究員 (40869559)
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| Project Period (FY) |
2020-04-01 – 2022-03-31
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| Keywords | perovskite solar cells / all-inorganic perovskite / high voltage / high efficiency |
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| Outline of Annual Research Achievements |
The target of this project is to developing high-performance and stable CsPbX3 perovskite solar cells. We have achieved the following results under the support of this project.
Firstly, a simple method of making an amorphous SnOx electron transporting layer was developed for improving the Voc of CsPbX3 solar cells. A record-high Voc of 1.41 V for CsPbI2Br (1.91 eV) solar cells with the efficiency of 15.53% was achieved.
Secondly, a new polymer PDTDT was synthesized and used as a dopant-free hole-transporting material, which boosted the efficiency of CsPbI2Br cells to 17.36%. The device performance (1 cm2 cell) was certified by AIST.
One paper was published in the Journal of American Chemistry Society and one more was submitted. One Japanese patent application was submitted.
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| Current Status of Research Progress |
Current Status of Research Progress
2: Research has progressed on the whole more than it was originally planned.
Reason
There are two specific aims of this project: developing high-performance CsPbX3 cells and improving the stability of CsPbX3 cells.
In the first year, we were focusing on increasing the efficiency of CsPbX3 cells by developing an efficient electron transporting layer of SnOx and hole-transporting materials of PDTDT. The successful development of these two parts of the solar cell structure enabled us to achieve superb device performances including Voc and efficiency. In addition, the synthesized PDTDT is working as a dopant-free hole-transporting material, which is also benefiting the stability of CsPbX3 cells because it is free of hydrophilic dopants.
The results of the first year not only realized the aim of developing high-performance CsPbX3 cells but also, to some extent, promoted the progress in improving the stability of CsPbX3 cells.
The results of the first year will be utilized in the next step of developing Bi-based inorganic oxyhalides BiOX (X= I, F, Cl, Br) compounds to protect moisture-sensitive CsPbX3 perovskites.
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| Strategy for Future Research Activity |
The next step of this project is to improve the stability of CsPbX3 solar cells.
Firstly, the developed amorphous SnOx and dopant-free polymer PDTDT will be continuously used in fabricating CsPbI3, CsPbI2.25Br0.75 and CsPbI2Br solar cells.
Secondly, as planned, we will study the method of constructing oxyhalides BiOX layer on top of perovskite film and study the effect of BiOX layer on the solar cell performance and stability.
The mechanism related to solar cell performance and stability will be elucidated.
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| Causes of Carryover |
In the year 2020, our research activities were hindered by the COVID-19 because of the emergency declaration in Japan. We worked at home for more than two months on paperwork rather than experiments and all the conferences were canceled, postponed, or changed to online. Therefore, the actual expenditure in the year 2020 was less than planned. We want to use the left amount in the next fiscal year (2021) by ordering necessary chemicals in our experiments, participating in conferences to share our results.
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Research Products
(4 results)
