{"created":"2023-05-15T15:23:30.896426+00:00","id":10361,"links":{},"metadata":{"_buckets":{"deposit":"b9296e6e-8f18-4de3-b342-3b7eef342a9a"},"_deposit":{"created_by":15,"id":"10361","owners":[15],"pid":{"revision_id":0,"type":"depid","value":"10361"},"status":"published"},"_oai":{"id":"oai:sucra.repo.nii.ac.jp:00010361","sets":["94:429:431:432:506"]},"author_link":[],"item_113_alternative_title_1":{"attribute_name":"タイトル（別言語）","attribute_value_mlt":[{"subitem_alternative_title":"導電性高分子PEDOT:PSSの光学異方性と結晶Si/PEDOT:PSSヘテロ接合太陽電池性能"}]},"item_113_biblio_info_9":{"attribute_name":"書誌情報","attribute_value_mlt":[{"bibliographicIssueDates":{"bibliographicIssueDate":"2015","bibliographicIssueDateType":"Issued"}}]},"item_113_date_35":{"attribute_name":"作成日","attribute_value_mlt":[{"subitem_date_issued_datetime":"2015-12-16","subitem_date_issued_type":"Created"}]},"item_113_date_granted_20":{"attribute_name":"学位授与年月日","attribute_value_mlt":[{"subitem_dategranted":"2015-03-24"}]},"item_113_degree_grantor_22":{"attribute_name":"学位授与機関","attribute_value_mlt":[{"subitem_degreegrantor":[{"subitem_degreegrantor_name":"埼玉大学"}],"subitem_degreegrantor_identifier":[{"subitem_degreegrantor_identifier_name":"12401","subitem_degreegrantor_identifier_scheme":"kakenhi"}]}]},"item_113_degree_name_21":{"attribute_name":"学位名","attribute_value_mlt":[{"subitem_degreename":"博士(工学)"}]},"item_113_description_13":{"attribute_name":"形態","attribute_value_mlt":[{"subitem_description":"ii, xviii, 118　p.","subitem_description_type":"Other"}]},"item_113_description_23":{"attribute_name":"抄録","attribute_value_mlt":[{"subitem_description":"Solar cells based on the crystalline silicon offer high efficiency of 25.6% (latest achievement from Panasonic), but they are expensive due to the high temperatures required in their fabrication. The alternative approach using low-temperature processable organic photovoltaics (OPV) is potentially cheaper, but the organic solar cells are not very efficient. In our work, we explore if organic semiconductor can be integrated with silicon to form hybrid organic/silicon solar cells that are both efficient and low-cost. Specifically, we demonstrate that a solution-processed silicon/organic heterojunction (SOH) can replace the conventional silicon p-n junction to yield solar cells with high power conversion efficiencies (>12%).\nAs we known, to generate a photovoltaic in a solar cell, the photo generated carries need to be spatially separated at two electrodes of opposite polarity. In solar cells this is typically accomplished using a p-n junction. While the p-n junction technology is well understood, the fabrication of p-n junction on silicon is expensive process because it requires ultra-clean furnaces, pure precursors and high temperatures. In our work, we successfully replace the silicon p-n junction with a silicon/poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS)  heterojunction that can be manufactured at low temperatures (＜ 140℃) with a simple spin-coating process. The key design rules to achieve a high efficiency are discussed and experimentally demonstrated, as follows. \na). The uniform coating of PEDOT:PSS thin films on hydrophobic Si substrates\nIn this work, commercialized highly conductive ink (Clevios PH1000) was used as precursor to form transparent hole transport layers on n-type silicon by simple spin-coating process, and a big problem here is the uniform coating of aqueous solution on the hydrophobic H-terminated Si surface. We demonstrate the usage of 0.1wt% Zonyl fluorosurfactant (DuPont) as an additive into PEDOT:PSS improved the adhesion of precursor solution on hydrophobic c-Si wafer. The average power conversion efficiency value was 11.3%, which was superior to those of non-treated devices. The Zonyl-treated soluble PEDOT:PSS composite is promising as a hole-transporting transparent conducting layer for c-Si/organic heterojunction(SOH) photovoltaic applications. \nb). Optical anisotropy in PEDOT:PSS and its effect on the photovoltaic performance of SOH solar cells\nIn this topic, we demonstrated the effect of uniaxial optical anisotropy on the photovoltaic performance of c-Si/organic heterojunction solar cells produced by spin coating using either a MeOH solvent or MeOH and EG cosolvents.   The systematic study of corresponding samples via spectroscopy ellipsometry implied that the use of the cosolvents led to an increase in extraordinary index of refraction and a reduction in the film thickness which promoted densification of polymer chains network in the resulted PEDOT:PSS thin films. And this improvement of PEDOT:PSS fine structure due to colsolvent addition resulted in an increased hole mobility from 1.23 cm2/V.s to 3.92 cm2/V.s of the resulted samples. A solar cell fabricated using such a film exhibited a relatively high efficiency of 11.23%, with a substantial fill-in factor (FF) value of 0.71. \nc). Employment of guest materials for further improvement of SOH solar cells efficiencies\nIn addition, varieties of functional material like graphene oxide, molybdenum oxide flake sheet, ferroelectric polymer poly (vinylidene fluoride tetrafluoroethylene) P(VDF-TeFE) were employed as dopant to improve carrier transport properties in SOH diodes and go advantage the solar cell performance.\nd). The photovoltaic performance of PEDOT:PSS/n-type poly-Si heterojucntion solar cell devices have been investigated. The high pressure H2O vapor treatment of poly-Si prior to the film deposition of organic promoted the reduction of dangling bond defects incorporated into poly-Si, resulting in the enhanced carrier collection efficiency at 850-1100 nm region. The chemical mist deposition of conductive PEDOT:PSS combined with negative DC bias supply improved significantly the adhesion of PEDOT:PSS on hydrophilic poly-Si wafer. As a consequence, a highly efficient PEDOT:PSS/poly-Si heterojunction solar cell was obtained with the highest power conversion efficiency of 9.8% with a Jsc  of 33 mA/cm2, a Voc  of 0.54 V, and a FF of 0.55. Such organic/poly-Si heterojunction cells can potentially further deliver high FF and conversion efficiency combining with the creation of ohmic junction at the rear surface.\nFinally we highlight the possible candidate approach which give a pathway for further improving the efficiency of c-Si/PEDOT:PSS hybrid solar cells.","subitem_description_type":"Abstract"}]},"item_113_description_24":{"attribute_name":"目次","attribute_value_mlt":[{"subitem_description":"Abstract . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .iii\nAcknowledgements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .v\nList of Tables . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . xii\nList of Figures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . xiii\n1 Introduction                                                                              1\n1.1 Motivation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1\n1.2 Silicon- based Hybrid Solar Cells . . . . . . . . . . . . . . . . . . . . . . . . . 3\n1.3 Solar Cells: Principle and Fundaments . . . . . . . . . . . . . . . . . . . . . 5\n1.4 How to Calculate Solar Cell’s Performance . . . . . . . . . . . . . . . . . 7\n1.4.1 Short-Circuit Current . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8\n1.4.2 Fill-Factor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11\n1.4.3 Open-Circuit Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12\n1.5 Outline . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14\n2   Silicon/PEDOT:PSS Heterojunctions Solar Cells with Modified Fine Structure of PEDOT:PSS                                     17\n2.1 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17\n2.2   Highly efficient SOH device with Zonyl fluorosurfactant treatment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .19\n2.3 Optical anisotropy in co-solvent modified PEDOT:PSS and its effect on the photovoltaic performance of crystalline silicon/organic heterojunction solar cells. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .29\n2.4 Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .40\n3 Employment of Guest Materials to Enhance the c-Si/PEDOT:PSS Hybrid Solar Cell Efficiency                          42\n3.1 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42\n3.2 Effects of Molybdenum Oxide Molecular Doping on the Chemical Structure of PEDOT:PSS and on \nCarrier Collection Efficiency of c-Si/PEDOT:PSS Heterojunction Solar Cells. . . . . . . . . . . . . . . . . . . . .43\n3.3 Improved Photovoltaic Performance of c-Si/PEDOT:PSS Hybrid Junction Solar Cells Using Ferroelectric Polymers. . . . . . . . . . . . . . . . 54\n3.4 Summary. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .68\n4 Efficient Poly-crystalline Silicon/PEDOT: PSS Hybrid Solar Cells                                                                                              70\n4.1 Motivation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 70\n4.2 Passivation of Defects in Grain Boundaries Using High Pressure Water Vapor Treatment for Enhanced Device Efficiency. . . . . . . . . . .71\n4.3 poly Si/PEDOT:PSS hybrid solar cells using CMD deposition to yield uniform coating . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 78\n4.4 Conclusion . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .84\n5 Conclusions and Future Work                                              85\n5.1 Summary of Results . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 85\n5.2 Future Work . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 88\nAppendix A Fabrication of SOH Devices                                93\nA.1 PEDOT:PSS Precursor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .93\nA.2 Cleaning of c-Si substrates   . . . . . . . . . . . . . . . . . . . . . . . . . . . . 95\nA.3 Deposition Methods . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 96\nA.3.1 Spincoating . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 96\nA.3.2 Chemical Mist Deposition . . . . . . . . . . . . . . . . . . . . . . . . . . . . .97\nAppendix B Characterization methods                                   99\nB.1 Spectroscopic ellipsometry (SE) . . . . . . . . . . . . . . . . . . . . . . . . . 99\nB.2 Atomic force microscope (AFM) . . . . . . . . . . . . . . . . . . . . . . . .100\nB.3 Spectrophotometer. . . . . . . . . . . . . . . . . . . .. . . . . . . . . . . . . . . . 102\nB.4 Solar simulator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 103\nB.5 Capacitance-voltage characteristic . . . . . . . . . . . . . . . . . . . . . . . 104\nPublications and Presentations                                                        107\n1. Papers in journals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .107\n2. Conference Presentations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 110\nReference                                                                                       112","subitem_description_type":"Other"}]},"item_113_description_25":{"attribute_name":"注記","attribute_value_mlt":[{"subitem_description":"指導教員 : 白井肇","subitem_description_type":"Other"}]},"item_113_description_33":{"attribute_name":"資源タイプ","attribute_value_mlt":[{"subitem_description":"text","subitem_description_type":"Other"}]},"item_113_description_34":{"attribute_name":"フォーマット","attribute_value_mlt":[{"subitem_description":"application/pdf","subitem_description_type":"Other"}]},"item_113_dissertation_number_19":{"attribute_name":"学位授与番号","attribute_value_mlt":[{"subitem_dissertationnumber":"甲第979号"}]},"item_113_identifier_registration":{"attribute_name":"ID登録","attribute_value_mlt":[{"subitem_identifier_reg_text":"10.24561/00010355","subitem_identifier_reg_type":"JaLC"}]},"item_113_publisher_11":{"attribute_name":"出版者名","attribute_value_mlt":[{"subitem_publisher":"埼玉大学大学院理工学研究科"}]},"item_113_publisher_12":{"attribute_name":"出版者名（別言語）","attribute_value_mlt":[{"subitem_publisher":"Graduate School of Science and Engineering, Saitama University"}]},"item_113_record_name_8":{"attribute_name":"書誌","attribute_value_mlt":[{"subitem_record_name":"博士論文（埼玉大学大学院理工学研究科（博士後期課程））"}]},"item_113_text_31":{"attribute_name":"版","attribute_value_mlt":[{"subitem_text_value":"[出版社版]"}]},"item_113_text_36":{"attribute_name":"アイテムID","attribute_value_mlt":[{"subitem_text_value":"GD0000642"}]},"item_113_text_4":{"attribute_name":"著者 所属","attribute_value_mlt":[{"subitem_text_value":"埼玉大学大学院理工学研究科（博士後期課程）理工学専攻"}]},"item_113_text_5":{"attribute_name":"著者 所属（別言語）","attribute_value_mlt":[{"subitem_text_value":"Graduate School of Science and Engineering, Saitama University"}]},"item_113_version_type_32":{"attribute_name":"著者版フラグ","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":"LIU, Qiming","creatorNameLang":"en"},{"creatorName":"リュウ, キミョウ","creatorNameLang":"ja-Kana"}]}]},"item_files":{"attribute_name":"ファイル情報","attribute_type":"file","attribute_value_mlt":[{"accessrole":"open_date","date":[{"dateType":"Available","dateValue":"2018-01-23"}],"displaytype":"detail","filename":"GD0000642.pdf","filesize":[{"value":"2.8 MB"}],"format":"application/pdf","licensetype":"license_note","mimetype":"application/pdf","url":{"label":"GD0000642.pdf","objectType":"fulltext","url":"https://sucra.repo.nii.ac.jp/record/10361/files/GD0000642.pdf"},"version_id":"ba03b573-5006-49ac-b0a4-193ec369f0fa"}]},"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":"Optical anisotropy of conjugated polymer PEDPT:PSS and its effect on Photovoltaic performance of crystalline-Si/PEDOT:PSS heterojunction solar cells","item_titles":{"attribute_name":"タイトル","attribute_value_mlt":[{"subitem_title":"Optical anisotropy of conjugated polymer PEDPT:PSS and its effect on Photovoltaic performance of crystalline-Si/PEDOT:PSS heterojunction solar cells","subitem_title_language":"en"}]},"item_type_id":"113","owner":"15","path":["506"],"pubdate":{"attribute_name":"PubDate","attribute_value":"2015-12-17"},"publish_date":"2015-12-17","publish_status":"0","recid":"10361","relation_version_is_last":true,"title":["Optical anisotropy of conjugated polymer PEDPT:PSS and its effect on Photovoltaic performance of crystalline-Si/PEDOT:PSS heterojunction solar cells"],"weko_creator_id":"15","weko_shared_id":-1},"updated":"2023-06-23T04:29:33.113697+00:00"}