{"created":"2023-05-15T11:59:43.957247+00:00","id":6301,"links":{},"metadata":{"_buckets":{"deposit":"7a035188-d45a-4086-8356-efda887fc8b8"},"_deposit":{"created_by":18,"id":"6301","owners":[18],"pid":{"revision_id":0,"type":"depid","value":"6301"},"status":"published"},"_oai":{"id":"oai:kyutech.repo.nii.ac.jp:00006301","sets":["6:7"]},"author_link":[],"item_20_date_granted_61":{"attribute_name":"学位授与年月日","attribute_value_mlt":[{"subitem_dategranted":"2019-09-20"}]},"item_20_degree_grantor_59":{"attribute_name":"学位授与機関","attribute_value_mlt":[{"subitem_degreegrantor":[{"subitem_degreegrantor_name":"九州工業大学"}],"subitem_degreegrantor_identifier":[{"subitem_degreegrantor_identifier_name":"17104","subitem_degreegrantor_identifier_scheme":"kakenhi"}]}]},"item_20_degree_name_58":{"attribute_name":"学位名","attribute_value_mlt":[{"subitem_degreename":"博士（工学）"}]},"item_20_description_30":{"attribute_name":"目次","attribute_value_mlt":[{"subitem_description":"1 Introduction||2. Experimental section of the general methods and characterization techniques||3. Enhancing the performance by MXene additive||4. Reducing the energy loss by interface passivation||5. Improving phase stability by metal doping||6. General conclusions and future prospects","subitem_description_type":"TableOfContents"}]},"item_20_description_4":{"attribute_name":"抄録","attribute_value_mlt":[{"subitem_description":"Perovskite solar cells （PSCs） is a hot research topic in recent years due to its high-speed development in device performance. However, the power conversion efficiency （PCE） is still lower than the theoretical limitation, and the stability is not satisfactory. These two issues are crucial for the commercialization of this photovoltaic technology. This thesis is mainly focusing on composition and interface engineering for achieving efficient and stable PSCs. Firstly, for improving the device performance, Ti3C2Tx, a kind of MXene, was introduced into the CH3NH3PbI3 perovskite film. The interaction between the additive and the perovskite precursor retards the perovskite crystal growth and results in larger crystals. The high conductivity of the Ti3C2Tx accelerates the charge transfer through the perovskite grain boundaries. The larger crystals and the better charge transfer process lead to a higher performance of the PSCs. Secondly, a simple surface passivation method using SnCl2 solution for SnO2 electron selective layer （ESL） was developed. This method can effectively reduce the charge recombination at the interface of all-inorganic CsPbIBr2 PSCs. The suppressed interfacial recombination leads to improved open-circuit voltage （Voc） and enhanced device performance. Thirdly, for improving the stability of the photoactive phase of all-inorganic CsPbI2Br, Nb5+ ions were incorporated into the perovskite materials. The Nb5+ doping not only stabilizes the perovskite materials but also reduces the charge recombination in the perovskite film, which enhances the device performance and results in hysteresis-free properties. In Chapter 1, the background of photovoltaic technologies and the current development, composition modification, device structure and film preparation methods of PSCs were introduced. Moreover, the challenges of the research in PSCs and the purposes of this thesis were presented. In Chapter 2, the reagents and apparatus for the PSCs fabrication were listed. The basic principle of the characterization techniques, such as XRD, SEM, UV-vis, PL, TRPL, and EIS, and the related instruments were introduced. Furthermore, the method of photovoltaic performance measurements for the PSCs were depicted. In Chapter 3, for enhancing the efficiency of the solar cells, the high conductivity two-dimensional Ti3C2Tx MXene was incorporated into the perovskite absorber layer. Results showed that the termination groups of the Ti3C2Tx can retard the nucleation rate of the perovskite, thereby increasing the crystal size of CH3NH3PbI3. The high electrical conductivity and mobility of MXene can accelerate the charge transfer through the perovskite grain boundaries. After optimizing the key parameters including Ti3C2Tx adding amount and the solvents for Ti3C2Tx, the champion PCE of the device was improved from 15.54% to 17.41% and the average PCE was increased from 15.18% to 16.80% with 0.03 wt% amount of Ti3C2Tx additive. In Chapter 4, for reducing the energy loss at the interface, a surface passivation process for SnO2 ESL employing SnCl2 solution was introduced. This passivation process successfully reduced the energy loss for high Voc output and consequently improved the performance of the all-inorganic CsPbIBr2 PSCs. With the surface passivation, the PCE was enhanced from 4.73% to 7.00% and a high Voc of 1.31 V was achieved, which is one of the highest Voc reported for the inorganic Cs-based PSCs. The main reason is that the surface passivation caused higher recombination resistance, resulting in suppressed recombination process at the interface between the perovskite and the SnO2. In Chapter 5, with the aim of stabilizing the photoactive phase of all-inorganic perovskite in ambient conditions, we incorporated the niobium （Nb5+） ions into the CsPbI2Br perovskite. Results indicate that Nb5+ incorporation effectively stabilized the photoactive α-CsPbI2Br phase by slight substitution of Pb2+. With carbon electrode, the all-inorganic perovskite solar cells achieved a record-high PCE of 10.42% with 0.5% Nb doping, 15% higher than that of the control device. The Nb5+ incorporation reduces the charge recombination in the perovskite, leading to a champion Voc of 1.27 V and negligible hysteresis effect. Finally, the general conclusions of this thesis were summarized and future prospects were proposed. The main issues for the PSCs still lie in the performance and stability. Some strategies such as controlling the perovskite film growth for generating large crystals, optimizing the interface for reducing the recombination and energy loss might be helpful to further improve the device performance. As for the phase stability of all-inorganic PSCs, the effective methods can be constructing a protection layer to prevent the humidity and metal doping to improve the tolerance factor of the structure. The PSCs are very promising for commercialization or using as part of tandem solar cells in practical application.","subitem_description_language":"en","subitem_description_type":"Abstract"}]},"item_20_description_5":{"attribute_name":"備考","attribute_value_mlt":[{"subitem_description":"九州工業大学博士学位論文 学位記番号:生工博甲第353号 学位授与年月日:令和元年9月20日","subitem_description_type":"Other"}]},"item_20_description_60":{"attribute_name":"学位授与年度","attribute_value_mlt":[{"subitem_description":"令和元年度","subitem_description_type":"Other"}]},"item_20_dissertation_number_62":{"attribute_name":"学位授与番号","attribute_value_mlt":[{"subitem_dissertationnumber":"甲第353号"}]},"item_20_identifier_registration":{"attribute_name":"ID登録","attribute_value_mlt":[{"subitem_identifier_reg_text":"10.18997/00007511","subitem_identifier_reg_type":"JaLC"}]},"item_20_text_34":{"attribute_name":"アドバイザー","attribute_value_mlt":[{"subitem_text_value":"馬, 廷麗"}]},"item_20_version_type_63":{"attribute_name":"出版タイプ","attribute_value_mlt":[{"subitem_version_resource":"http://purl.org/coar/version/c_970fb48d4fbd8a85","subitem_version_type":"VoR"}]},"item_access_right":{"attribute_name":"アクセス権","attribute_value_mlt":[{"subitem_access_right":"open access","subitem_access_right_uri":"http://purl.org/coar/access_right/c_abf2"}]},"item_creator":{"attribute_name":"著者","attribute_type":"creator","attribute_value_mlt":[{"creatorNames":[{"creatorName":"郭,  章林","creatorNameLang":"ja"},{"creatorName":"Guo,  Zhanglin","creatorNameLang":"en"}]}]},"item_files":{"attribute_name":"ファイル情報","attribute_type":"file","attribute_value_mlt":[{"accessrole":"open_date","date":[{"dateType":"Available","dateValue":"2020-01-06"}],"displaytype":"detail","filename":"sei_k_353.pdf","filesize":[{"value":"5.6 MB"}],"format":"application/pdf","licensetype":"license_note","mimetype":"application/pdf","url":{"label":"sei_k_353.pdf","objectType":"fulltext","url":"https://kyutech.repo.nii.ac.jp/record/6301/files/sei_k_353.pdf"},"version_id":"74fddcd4-e5a3-43cb-a7e4-31285fdc9c52"}]},"item_keyword":{"attribute_name":"キーワード","attribute_value_mlt":[{"subitem_subject":"Perovskite Solar Cells","subitem_subject_scheme":"Other"},{"subitem_subject":"Composition Engineering","subitem_subject_scheme":"Other"},{"subitem_subject":"Interface Engineering","subitem_subject_scheme":"Other"},{"subitem_subject":"High Efficiency","subitem_subject_scheme":"Other"},{"subitem_subject":"High Stability","subitem_subject_scheme":"Other"}]},"item_language":{"attribute_name":"言語","attribute_value_mlt":[{"subitem_language":"eng"}]},"item_resource_type":{"attribute_name":"資源タイプ","attribute_value_mlt":[{"resourcetype":"doctoral thesis","resourceuri":"http://purl.org/coar/resource_type/c_db06"}]},"item_title":"Composition and Interface Engineering of Efficient and Stable Perovskite Solar Cells","item_titles":{"attribute_name":"タイトル","attribute_value_mlt":[{"subitem_title":"Composition and Interface Engineering of Efficient and Stable Perovskite Solar Cells","subitem_title_language":"en"},{"subitem_title":"高効率かつ安定なペロブスカイト太陽電池の組成制御及び界面エンジニアリング","subitem_title_language":"ja"}]},"item_type_id":"20","owner":"18","path":["7"],"pubdate":{"attribute_name":"PubDate","attribute_value":"2020-01-06"},"publish_date":"2020-01-06","publish_status":"0","recid":"6301","relation_version_is_last":true,"title":["Composition and Interface Engineering of Efficient and Stable Perovskite Solar Cells"],"weko_creator_id":"18","weko_shared_id":-1},"updated":"2024-01-16T02:11:53.828572+00:00"}