藉由濕式製程混和聚3-己基噻吩（P3HT）與PbS量子點（QD）所製成的混合型太陽能電池（HSC）由於其材料成本低且製程簡單因此非常具有發展潛力。但是，P3HT與具有油酸（OA）配體的PbS QD不兼容，這會導致嚴重的相分離，從而導致所需的雙連續網絡表面形態的效果較差，從而導致電荷收集效率低下。在這篇論文中首次提出了以聚苯乙烯與P3HT的嵌段共聚物改善聚合物與油酸之間的互溶性，從而朝著所需的雙連續網絡形態發展，這是通過在我們先前的報告中使用耗散動態模擬來完成的，因此元件效率從3.66% 提升4.18%。 雙連續電荷通道是整體異質接面太陽能電池中的理想形態，在先前的報告中對於P3HT / QD和低能隙聚合物/ QD系統均未明確觀察到。 不僅如此，P3HT和P3HT-b-PS的混合物可減少非導電聚苯乙烯的含量並保留雙連續電荷通道。 由於在有效層中形成了高質量的雙連續電荷傳輸通道，重量比為0.7：0.3：20的P3HT：P3HT-b-PS：PbS QD系統的功率轉換效率（PCE）達到了4.91%，比P3HT（3.66%）的功率轉換效率高1.25%，。此外，當PEDOT：PSS作為電洞傳輸層（HTL）摻雜有四丁基碘化銨（TBAI）時，其PCE可以進一步提高到5.37%。據我們所知，我們元件的性能（4.91%和5.37%）是目前所發表過的最新P3HT/QD系統中最好的（4.32%）。

Hybrid Solar Cell (HSC) based on solution-processed blends of poly(3-hexylthiophene) (P3HT) with PbS quantum dot (QD) is a potential candidate toward practical use for its low material cost and simple fabrication process. However, P3HT is highly incompatible with oleic acid (OA)-capped PbS QD that leads to strong phase separation giving poor quality in desired bi-continuous networks morphology and thus leading to inefficient charge collection. Here, a block copolymer of Polystyrene with P3HT is proposed for the first times to improve the miscibility between polymers and Oleic acid, therefore improving toward the desired bi-continuous network morphology, which are performed by using dissipative dynamic simulations in our previous report and thus device performance improved from 3.66% to 4.18%. Bi-continuous charge channel is an ideal morphology in bulk heterojunction solar cell, which has not been clearly observed in previous reports for both P3HT/QD and low band gap polymer/QD system. Not only that, the blend of P3HT and P3HT-b-PS to reduce the content of non-conducting polystyrene and retain a bi-continuous charge channel. Thus, the power conversion efficiency (PCE) of P3HT:P3HT-b-PS:PbS QD system with weight ratio of 0.7 : 0.3 : 20 is 4.91%, which is better than that of P3HT (3.66%) by 1.25% due to the formation of high quality of bi-continuous charge transport channels in the active layer. In addition, PCE can be further promoted to 5.37% when PEDOT:PSS as the hole transport layer (HTL) is doped with tetrabutylammonium iodide (TBAI). To the best of our knowledge, these performance (4.91% and 5.37%) are the best among the reported state-of-the-art P3HT/QD system (4.32%).

Chapter 1: Introduction 1
1-1 The development of solar cell 1
1-2 Solar radiation 3
1-3 Solar cell 6
1-3-1 The principle of solar cell 6
1-3-2 Characteristics of Solar Cells 9
1-4 Polymer solar cell 11
1-4-1 Conjugated polymer 11
1-4-2 The electronic state theory of conjugated polymers 12
1-4-3 Organic solar cell structure evolution 14
1-5 Quantum dot solar cell 18
1-5-2 Multiple exciton generation 20
1-5-3 Quantum dot solar cell structure evolution 22
1-5-4 Polymer/quantum dot hybrid solar cell 24
Chapter 2: Literature review 26
2-1 In Situ Passivation for Efficient PbS Quantum Dot Solar Cells 26
2-2 Polymer/quantum dot hybrid solar cell 28
2-3 Literature analysis 38
Chapter 3: Method 40
3-1 Chemicals 40
3-2 General measurement and characterization 41
3-3 Synthesis 42
3-3-1 Preparation of Poly(3-hexylthiophene) with bromo group at one terminal 42
3-3-2 Preparation of Polystyrene with end group of pinacol boronic ester 43
3-3-3 Preparation of Block Copolymer P3HT-b-PS 43
3-3-4 Synthesis of PbS QD 44
3-4 Device fabrication and measurement 45
Chapter 4: Results and discussion 47
4-1 Physical and optical properties of block copolymer and quantum dot 47
4-1-1 Molecular weight of polymers 47
4-1-2 Fourier-transform infrared spectroscopy (FTIR) 48
4-1-3 Ultraviolet-visible (UV-Vis) of polymers 49
4-2 The influence of the mixing ratio of P3HT and PbS quantum dots on the device 50
4-3 The influence of thermal annealing on performance of quantum dots hybrid solar cell. 53
4-4 The influence of block copolymer P3HT-b-PS on morphology of active layer. 55
4-5 The influence of blend ratio of P3HT and P3HT-b-PS on morphology of active layer. 60
4-6 The improved performance of device by doping TBAI into PEDOT:PSS 63
4-7 Conclusion 66
Chapter 5: References 68

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