Conjugated Polymer Electrolyte for High-Performance Polymer Solar Cells
- Alternative Title
- 고성능 고분자 태양전지를 위한 공액형 고분자전해질
- Abstract
- A series of conjugated polymer electrolytes (CPEs) based on dimethylamino propyl fluorene (FN), thiophene (T), benzothiadiazole (BT), and dithienyl benzothiadiazole (TBT) were synthesized by the Suzuki coupling reaction. Quaternarized polyelectrolytes were obtained from the post-polymerization treatment of the amino-terminal group. The incorporation of electron-rich (T), electron-deficient moieties (BT), and their combination (TBT) in the polymer backbone represent the different effects of polarity. Conjugated backbones are strengthened by varying their electron affinity and conjugated planarity. We systematically investigated the effect of applying CPEs with different backbones and functionalities in the side chain. Different backbones produce different molecular dipoles, and the side chain functionality induces an interfacial dipole. Inverted polymer solar cells (iPSCs) based on a bulk heterojunction (BHJ) were fabricated with the ITO/ZnO/CPE/PTB7- Th:PC71BM/MoO3/Ag structure. The device performance enhancement was achieved by inserting CPEs as the interlayer. Modifying the polymer backbone leads to improved efficiency and modifying the side chain functionality improves the performance compared with that of the interlayered neutral polymer.|Dimethylamino propyl fluorene(FN)을 기반으로 하는 공액 고분자 전해질(CPEs)의 thiophene(T), benzothiadiazole(BT) 및 dithienyl benzothiadiazole(TBT)는 스즈키 커플링 반응에 의해서 합성되는 고분자 전해질이다. 쿼터너리 된 고분자전해질은 고분자를 합성한 이후에 아미노의 말단기 그룹을 변화시켰고 이 공액 주쇄는 전자 친화력 및 공액 평면화에 의해서 실질적으로 강화된다. 전자가 풍부한 thiophene (T)과 전자가 부족한 benzothiadiazole (BT), 그리고 두개의 조합인(TBT) 그룹들의 서로 다른 극성 효과의 성질을 이용하여 dimethylamino propyl fluorene (FN) 고분자의 주쇄에 각각 추가하였고 이를 통해 고분자 전해질(CPE)의 주쇄에서의 효과 및 측쇄의 말단기 변화를 통한 효과를 연구하였다. 서로 다른 주쇄들이 다른 분자들의 쌍극자를 유도하고, 측쇄의 기능기는 계면의 쌍극자를 유도한다. Bulk heterojunction (BHJ)를 기반으로 inverted polymer solar cells (iPSCs)의 소자를 ITO/ZnO/CPE/PTB7-Th:PC71BM/MoO3/Ag의 구조로 제작하였다. 소자의 성능은 중간층인 CPE를 추가 및 고분자 전해질의 주쇄를 변화시켰을 때 향상되었으며, 측쇄의 말단기가 변화함으로써 아미노 중성 고분자에 비해 높은 효율을 얻을 수 있게 되었다.
- Issued Date
- 2023
- Awarded Date
- 2023-02
- Type
- Dissertation
- Publisher
- Pukyong National University
- Affiliation
- Pukyong National University, Graduate School
- Department
- 대학원 화학융합공학부
- Advisor
- Joo Hyun Kim
- Table Of Contents
- CHAPTER I 1
1. ORGANIC / POLYMERIC SOLAR CELLS 2
1). PHOTOGENERATION MECHANISM 4
(1) ABSORPTION OF PHOTONS 8
(2) REFLECTION 8
(3) EXCITON DIFFUSION 8
(4) CHARGE SEPARATION 9
(5) CHARGE TRANSPORT 9
(6) CHARGE COLLECTION 9
2). PHOTOACTIVE LAYER 10
3). ELECTRODE MATERIALS 15
4). INTERFACIAL LAYER 16
(1) ANODE BUFFER LAYER 16
(2) CATHODE BUFFER LAYER 17
5). PHOTOVOLTAIC CHARACTERIZATION 20
(1) POWER CONVERSION EFFICIENCY 20
(2) OPEN CIRCUIT VOLTAGE 25
(3) PHOTOCURRENT 26
CHAPTER II 29
INVESTIGATING THE EFFECT OF DIVERSE STRUCTURAL VARIATION OF CONJUGATED POLYMER ELECTROLYTES AS THE INTERLAYER ON PHOTOVOLTAIC PROPERTIES 30
2. RESULT AND DISCUSSION 36
1). OPTICAL AND ELECTROCHEMICAL PROPERTIES 36
2). THEORETICAL CALCULATION OF THE POLYMERS 43
3). OPTICAL SIMULATION CHARACTERISTIC OF CPES USING TRANSFER MATRIX FORMALISM 47
4). INVESTIGATION OF CPE-COVERED ZNO SURFACE 50
5). PHOTOVOLTAIC PROPERTIES 55
6). ELECTRONIC IMPEDANCE SPECTROSCOPY (EIS) OF PSCS 71
3. CONCLUSION 73
CHAPTER III 74
EFFECT OF THE SIDE CHAIN FUNCTIONALITY OF THE CONJUGATED POLYELECTROLYTES AS A CATHODE INTERLAYER MATERIAL ON THE PHOTOVOLTAIC PERFORMANCES 75
1. INTRODUCTION 75
2. RESULT AND DISCUSSION 80
1.) OPTICAL AND ELECTROCHEMICAL PROPERTIES 80
2.) THEORETICAL CALCULATION OF THE POLYMERS 82
3.) INVESTIGATION OF THE ZNO SURFACE COVERED WITH CPES 84
4.) PHOTOVOLTAIC PROPERTIES 88
3. CONCLUSION 96
REFERENCES 97
ACKNOWLEDGEMENT 126
- Degree
- Doctor
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