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アイテム
非鉛ペロブスカイト太陽電池におけるビスマス系光吸収材料に関する研究
https://doi.org/10.18997/00007201
https://doi.org/10.18997/000072011f066cb0-25b9-47ac-a2bd-ff4ee6282a5b
| 名前 / ファイル | ライセンス | アクション |
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sei_k_334.pdf (3.4 MB)
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| アイテムタイプ | 学位論文 = Thesis or Dissertation(1) | |||||||
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| 公開日 | 2019-06-13 | |||||||
| 資源タイプ | ||||||||
| 資源タイプ識別子 | http://purl.org/coar/resource_type/c_db06 | |||||||
| 資源タイプ | doctoral thesis | |||||||
| タイトル | ||||||||
| タイトル | Studies on Bismuth-based Light Absorbers for Lead-free Perovskite Solar Cells | |||||||
| 言語 | en | |||||||
| タイトル | ||||||||
| タイトル | 非鉛ペロブスカイト太陽電池におけるビスマス系光吸収材料に関する研究 | |||||||
| 言語 | ja | |||||||
| 言語 | ||||||||
| 言語 | eng | |||||||
| 著者 |
Zhang, Chu
× Zhang, Chu
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| 抄録 | ||||||||
| 内容記述タイプ | Abstract | |||||||
| 内容記述 | Lead-free bismuth perovskites have been considered as a promising substitute for the lead halide perovskites aiming at solving the instability and toxicity issues. However, lead-free perovskites still suffer from low efficiency problems due to their large bandgap and poor-quality film. In order to achieve high power conversion efficiency while maintaining the advantages of stability and non-toxicity, it is crucial to develop new lead-free perovskite materials. In this thesis, two kinds of new lead-free perovskites with small bandgap and excellent stability were synthesized via simple procedures. With various characteristic methods, the composition of these new perovskites was determined, and their optoelectronic properties were analyzed. Moreover, these materials were applied to the perovskite solar cells, and their performances as the light absorbers were evaluated. Based on these results, the potential routes for improving the performances of the lead perovskite photovoltaic devices were developed. In chapter 1, the background of the photovoltaic technology and the current development of the lead-free perovskites were introduced. Furthermore, the recent challenges for the lead-free perovskites and the purpose of this thesis were described. In chapter 2, the reagents and apparatus employed in this thesis were listed. Furthermore, general descriptions of the preparation methods and the device fabrication techniques were displayed. In addition, the basic principles of the physical and optoelectronic characterization methods were introduced. In chapter 3, a mixed chalcogenide-halide lead-free perovskite MABiI2S was successfully synthesized through a simple two-step solid-state process. With multiple testing methods, the composition of the MABiI2S perovskite was confirmed. By measuring the UV-Vis absorption spectra, it is determined that the MABiI2S perovskite has a bandgap of 1.52 eV, and it possesses a wide absorption range. The unique properties of the MABiI2S perovskite meet the criteria of the light absorber for the perovskite solar cells. Furthermore, by employing an in-situ growth process, the difficulty that the spin coating technique cannot produce viable MABiI2S films on the TiO2 substrates was solved. The composition of the in-situ growth film was verified with layer-by-layer XRD pattern analysis. Photovoltaic devices were fabricated with the MABiI2S perovskite, and the device performances were evaluated. Although the PCE of the MABiI2S solar cell was low, the factors that hindered the device performance were proposed and possible enhancement methods were performed. In chapter 4, a novel high stability double perovskite Cs2NaBiI6 was successfully synthesized through a simple hydrothermal process. The bandgap of the Cs2NaBiI6 was determined to be 1.66 eV, and a wide absorption range of the Cs2NaBiI6 up to 650 nm was revealed. The Cs2NaBiI6 displayed outstanding stability showing negligible decomposition after a 5-month storage under >70% humidity. Perovskite solar cells fabricated with Cs2NaBiI6 exhibited comparable PCE to other bismuth perovskite solar cells. The devices stayed in ambient condition displayed a very small decrease in the photovoltaic performances, suggesting good device stability. The PCE distribution of the cells is narrow, suggesting that the devices displayed good reproducibility. Although the average PCE of the Cs2NaBiI6 solar cells so far is not high due to a low JSC, we have revealed the main reason of the low JSC, and suggested possible enhancement directions. In chapter 5, 3D shuttle-like Cs2NaBiI6 micro single crystals were prepared by a simple one-step hydrothermal growth method. By observing the growth process, the growth mechanism of the micro single crystals were elucidated, and it was confirmed that the Cs2NaBiI6 prepared with the optimized conditions consists high ratio of well-defined shuttle-like micro single crystals. Moreover, by investigating multiple reaction parameters including hydroiodic acid concentration, Na cation ratio and hydrothermal synthesizing temperature, the optimized preparation condition of the micro single crystal growth was explored. Finally, general conclusions of this thesis were summarized and future prospects were proposed. The development of lead-free perovskites and lead-free perovskites photovoltaic devices still face big challenges. The further studies include the development of new lead-free perovskites with high performance, enhancement of the film fabricating technique of the lead-free perovskite solar cell devices, and the exploration towards the single crystal lead-free perovskite photovoltaic devices. | |||||||
| 言語 | en | |||||||
| 目次 | ||||||||
| 内容記述タイプ | TableOfContents | |||||||
| 内容記述 | 1 Introduction||2 Experimental section of the general methods and characterization techniques||3 Development of a Mixed Halide-chalcogenide Bismuth-based Perovskite MABiI2S with Small Bandgap and Wide Absorption Range||4 Design of a Novel and Highly Stable Lead-Free Double Perovskite Cs2NaBiI6 for Photovoltaic Application||5 Preparation and optimization of the micro single crystals of the Cs2NaBiI6 （CNBI） double perovskite||6 General conclusions and future prospects | |||||||
| 備考 | ||||||||
| 内容記述タイプ | Other | |||||||
| 内容記述 | 九州工業大学博士学位論文 学位記番号：生工博甲第334号 学位授与年月日：平成31年3月25日 | |||||||
| キーワード | ||||||||
| 主題Scheme | Other | |||||||
| 主題 | Perovskites | |||||||
| キーワード | ||||||||
| 主題Scheme | Other | |||||||
| 主題 | Solar cells | |||||||
| キーワード | ||||||||
| 主題Scheme | Other | |||||||
| 主題 | Lead-free perovskites | |||||||
| キーワード | ||||||||
| 主題Scheme | Other | |||||||
| 主題 | Bandgap tuning | |||||||
| キーワード | ||||||||
| 主題Scheme | Other | |||||||
| 主題 | Stability | |||||||
| アドバイザー | ||||||||
| 馬, 廷麗 | ||||||||
| 学位授与番号 | ||||||||
| 学位授与番号 | 甲第334号 | |||||||
| 学位名 | ||||||||
| 学位名 | 博士（工学） | |||||||
| 学位授与年月日 | ||||||||
| 学位授与年月日 | 2019-03-25 | |||||||
| 学位授与機関 | ||||||||
| 学位授与機関識別子Scheme | kakenhi | |||||||
| 学位授与機関識別子 | 17104 | |||||||
| 学位授与機関名 | 九州工業大学 | |||||||
| 学位授与年度 | ||||||||
| 内容記述タイプ | Other | |||||||
| 内容記述 | 平成30年度 | |||||||
| 出版タイプ | ||||||||
| 出版タイプ | VoR | |||||||
| 出版タイプResource | http://purl.org/coar/version/c_970fb48d4fbd8a85 | |||||||
| アクセス権 | ||||||||
| アクセス権 | open access | |||||||
| アクセス権URI | http://purl.org/coar/access_right/c_abf2 | |||||||
| ID登録 | ||||||||
| ID登録 | 10.18997/00007201 | |||||||
| ID登録タイプ | JaLC | |||||||
