2019-08-012024-05-18https://scholars.lib.ntu.edu.tw/handle/123456789/704397摘要：近十年來得利於化學合成與元件製作技術的蓬勃發展，高分子太陽能電池取得突破性的進展。然而，光電轉換效率雖然已突破10%的關卡，離市面上動輒高於20%的產品還有一段不小的差距，且在進一步提升效率方面也已面臨瓶頸。另一方面，即使10%的效率勉強達到產業化的門檻，長效穩定性仍遠不足以和目前商業化產品匹敵。目前最成功的高分子太陽能電池其主動層為塊材異質接合(bulk heterojunction)結構，由施體共軛高分子與受體富勒烯衍生物混摻而成，且最佳化結構一般為動力學上的非穩定態。這個結構極其複雜，包括施體與受體的相容性、結晶性、分子運動速率、相分離結構等重要因子都會對電池的表現產生重大影響，尤其是長效穩定性。過去高分子太陽能電池的研究著重分子設計與元件最佳化，較少著墨在基礎高分子物理與結構的探討。為了進一步提升高分子太陽能電池效能，回過頭從物理角度來檢視分子聚集結構與光電性質的關係有其必要。這個計畫的目的是運用我們在高分子物理結構及散射技術的專長，深入探討目前幾類代表性高分子太陽能電池系統中施體與受體間的交互作用，尤其是動力學與熱力學上的混摻相行為與結構。我們希望透過這個基礎研究能提出高效率、高穩定性高分子太陽能電池的設計新方向。<br> Abstract: For a decade of the prosperous developments of chemical synthesis and device fabrication techniques, there has been a significant progress in polymer solar cells. However, although the power conversion efficiency has exceeded 10%, it is still far below those of the commercial products whose efficiencies are generally above 20%, and a bottleneck seems to be encountered in the attempt to further increase the efficiency. Furthermore, even though 10% has marginally reached the threshold for commercialization, the long-term stability of polymer solar cells is much inferior to that of the products in markets. The most successful polymer solar cells nowadays are all in a so-called bulk heterojunction architecture, formed by blending of conjugated polymer donors and fullerene-derivative acceptors, and the optimized structures is generally the kinetically frozen phases, not the thermodynamically stable ones. Many factors may govern the complicated structures of unstable polymer blends, including the miscibility, the crystallization, the mobility, and the phase-separated structures of the donors and acceptors, all of which considerably affect the performance of polymer solar cells, especially the long-term stability. Most of the previous studies in polymer solar cells focused on the molecular design and device optimization, and less of them put effort on the fundamentals of the polymer physics and structures. To further enhance the performance based on the recent developments, the elucidation of the relationship between molecular aggregation structures and electrical/optical properties should be the key. The goal of this proposal is to apply our expertise in polymer physics and scattering techniques to comprehensively investigate the interplays between donors and acceptors in the representative systems of polymer solar cells, particularly the thermodynamics and kinetics aspects of phase behaviors and structures in polymer blends. Through this study, we hope to provide a new direction for the design of polymer solar cells that simultaneously show high efficiency and high long-term stability.共軛高分子太陽能電池相分離行為結構穩定性conjugated polymersolar cellphase behaviorstructurestability