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Synthesis and Characterization of Polymers based on Benzimidazole Segments for Polymer Solar Cells

Title
Synthesis and Characterization of Polymers based on Benzimidazole Segments for Polymer Solar Cells
Translated Title
벤즈이미다졸을 포함하는 고분자 태양전지용 고분자의 합성 및 특성 분석
Authors
Kim, Ha Young
DGIST Authors
Kim, Ha Young; Lee, Youn Gu; Kim, Dae Hwan
Advisor(s)
Lee, Youn Gu
Co-Advisor(s)
Kim, Dae Hwan
Issue Date
2013
Available Date
2016-05-18
Degree Date
2013. 2
Type
Thesis
Keywords
공액 고분자벤즈이미다졸벤조다싸이오펜전자 주개-받게 구조polymer solar cellsbenzimidazolebenzodithiophenedonor-acceptor structureconjugated polymers고분자 태양전지
Abstract
To enhance performance of polymer solar cells, a series of polymers which were based on electron-deficient benzimidazole segments and electron-rich benzodithiophene segments for polymer solar cells were designed and synthesized by the Stille polycondensation. The synthesized polymers which had long alkyl side chain exhibited good solubility in organic solvents. The optical and electrochemical properties of polymers were measured by UV/Vis spectroscopy and cyclic voltammetry (CV). The resulting polymers exhibited low optical bandgaps and electrochemical bandgaps. Furthermore, HOMO and LUMO energy levels of -3.4 ~ 6.0 eV were suitable for photovoltaic applications. These HOMO and LUMO energy levels are appropriate for charge transport to achieve high performance of polymer solar cells. The optical and electrochemical properties were tuned by introducing different substituents and alkyl side chains on benzimidazole segments. The polymer solar cells with benzimidazole based polymer achieved power conversion efficiency close to 1% due to their enhanced light harvesting property and efficient interpenetrating network which were caused by a hydrogen atom on benzimidazole segment and a lack of long alkyl side chain. This work implies that the electron-deficient benzimidazole segments based polymers can achieve high PCE through structural modification of the polymer. ⓒ 2013 DGIST
Table Of Contents
1. INTRODUCTION 1 -- 2. THEORETICAL BACKGROUND 3 -- 2.1. Principle and Characters of Polymer Solar Cells 3 -- 2.2. Structures of Polymer Solar Cells 7 -- 2.3. Donor-Acceptor Polymers for Polymer Solar Cells 10 -- 2.4. Improvement of Performance of Polymer Solar Cells 15 -- 2.4.1. Improvement of Light Absorption 15 -- 2.4.2. New Device Structures 16 -- 3. EXPERIMENTAL 18 -- 3.1. Synthesis of Materials 18 -- 3.1.1. Synthesis of Monomers 18 -- 3.1.2. Synthesis of Polymers 26 -- 3.2. Fabrication of Devices 29 -- 3.3. Measurement and Characterization 30 -- 4. RESULT AND DISCUSSION 31 -- 4.1. Physical Properties of Polymers 31 -- 4.2. Optical Properties of Polymers 34 -- 4.3. Electrochemical Properties of Polymers 37 -- 4.4. Photovoltaic Properties of Polymers 39 -- 5. CONCLUSION 41 -- REFERENCES 43 -- SUMMARY 48 -- ACKNOWLEDGEMENT 49
URI
http://dgist.dcollection.net/jsp/common/DcLoOrgPer.jsp?sItemId=000002262495
http://hdl.handle.net/20.500.11750/1324
DOI
10.22677/thesis.2262495
Degree
Master
Department
Energy Systems Engineering
University
DGIST
Files:
Collection:
Energy Science and EngineeringThesesMaster


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