2022 Fiscal Year Annual Research Report
Towards Stable and Highly Efficient Lead-Free Tin-based Perovskite Solar Cells
| Project/Area Number |
22H02190
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| Allocation Type | Single-year Grants |
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| Research Institution | National Institute for Materials Science |
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Principal Investigator |
イスラム アシュラフル 国立研究開発法人物質・材料研究機構, エネルギー・環境材料研究センター, 主席研究員 (70531177)
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| Project Period (FY) |
2022-04-01 – 2025-03-31
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| Keywords | Perovskite solar cells / Sn perovskite / Charge-transfer dynamics |
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| Outline of Annual Research Achievements |
During the last year, I have fabricated Sn-based perovskite solar cells (Sn-PSCs) with different device structures: 1) planar inverted; 2) graded planar inverted; 3) planar normal structure; and 4) mesoporous normal structure. The photovoltaic performances of Sn-PSCs with different device structures were evaluated by J-V characteristics, external quantum efficiency (EQE), studying carrier dynamics and spectral sensitivity measurement and planar inverted structure shows the best performance. The research results are presented at international scientific meeting and published in peer reviewed scientific journals.
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| Current Status of Research Progress |
Current Status of Research Progress
3: Progress in research has been slightly delayed.
Reason
During the fabrication of Sn-PSCs, I found difficulties to control thickness of perovskite layer and charge transport layers in different device structures. Since it is essential to control the different film thickness, an optimized fabrication method was developed for different device structures after discussions with experts which delayed my research schedule from the original time frame. Due to this reason, I could not complete some research tasks in Phase I.
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| Strategy for Future Research Activity |
Phase II: Compositional engineering of perovskite materials and perovskite film growth with superior morphology using Lewis-base additive.Task 1: Prepare Sn-based perovskite thin films containing mixed cations in different composition. Finally, a potential Lewis-base additive will use during perovskite growth for superior film morphology.Task 2: Evaluate the basic electronic properties of the prepared Sn-based perovskite thin films in Task 1. Clarify the correlation between the composition of the perovskite thin film and the energy level.
Task 3: Fabricate Sn-PSCs with optimal device structure observed in Phase I and using optimal Sn-perovskite film found in Task 2. Photovoltaic performances of the Sn-PSCs fabricated in Task 2. will be evaluated.Phase III: Energy level tuning of charge transport materials suitable for Sn-PSCs: Fabrication of efficient all inorganic gradient 1D/3D structured Sn-PSCsTask 1: Necessary tuning of the CB and VB levels of the inorganic ETMs and HTMs, respectively, will be done by the addition of dopant.Task 2: Fabrication of gradient 1D/3D structured Sn-perovskite film by spin coating of large organic cations like 4-tert-butylpyridinium iodide (TBPI) on top of the 3D Sn-perovskite thin films to form quasi 1-dimensional (1D) perovskite films. Task 3: Fabrication of all inorganic gradient 1D/3D structured Sn-PSCs using carbon-based materials or inorganic nanoparticles and 1D/3D structured Sn-perovskite film. Photovoltaic performances and the long-term stability of the PSCs will be evaluated.
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