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標題: | 合成噻吩-呋喃小分子於溶液製程有機太陽能電池的應用 Synthesis of Oligo(thienylfuran)s for Solution Processed Organic Photovoltaics |
作者: | Chia-Wen Chiang 江嘉文 |
指導教授: | 鄭如忠(Ru-Jong Jeng) |
關鍵字: | 噻,吩,呋,喃,有機小分子,太陽能電池, furan,thiophene,solar cell, |
出版年 : | 2013 |
學位: | 碩士 |
摘要: | 本研究合成設計線型共軛小分子含不同五元雜環之衍生物-呋喃 (furan, F)或噻吩 (thiophene, T),並應用於溶液製程有機太陽能電池。共軛小分子結構上以雙噻吩 (bithiophene, BT) 為中心,經由 Stille coupling 和 Knoevenagel condensation 合成共軛鏈段由 TT 或 TF 組成,且末端含3-乙基-2硫代-4-噻唑烷二酮 (3-ethylrhodanine) 之拉電子基的線型共軛小分子 TT-BT-TT 和 TF-BT-FT 。TT-BT-TT 與 TF-BT-FT 在一般有機溶劑下具備有不錯的溶解度和良好的熱穩定性。由紫外光-可見光光譜發現,TF-BT-FT 因結構上導入立體障較小之五元雜環F,使分子間排列較緊密,其吸收光譜較 TT-BT-TT 紅位移並降低能隙。由光電子光譜儀由光電子光譜儀推測,調控 HOMO能階高低的原因是由不同五元雜環的導入能調整線型小分子的共軛平面間的旋轉角度,影響堆疊和有效共軛長度。初步將線型共軛小分子材料與 PC61BM 混摻 (1:1, w/w) 製備成太陽能電池之主動層,元件採用反式結構,其中氧化锌作為元件電子選擇層和三氧化鉬為電洞選擇層,再使用銀為陽極和氧化銦錫為陰極。在 AM 1.5照度下 TT-BT-TT 和 TF-BT-TT 之光伏參數:開路電壓為 0.71 與0.73 V,短路電流為2.31與1.94 mAcm-2,填充因子為0.29與0.30,轉換效率為0.49 與0.43 %。結果顯示立體障礙較小之五元雜環呋喃的導入能有效增加小分子吸收太陽光特性,增加光電轉換效率。 Two different acceptor-donor-acceptor (A-D-A) five-membered heterocycles incorporated with rhodanine units as the terminal acceptor groups, TF-BT-FT and TT- BT-FF were synthesized for solution –processable organic small molecule solar cell. Furan was introduced onto the structure of TF-BT-FT to reduce the degree of distortion, along with octyl groups to acquire better molecular ordering. Moreover, TF-BT-FT and TT-BT-TT were end-capped with electron–deficient rhodanine units to broaden absorption regions. These small molecules exhibited good solubility and thermal stability. Investigated by UV-visible spectrophotometer, the absorption spectrum of TF-BT-FT is was red-shifted relative to that of TT-BT-TT. The bathochromic shift indicates that the TF-BT-FT exhibited a lower band gap than did TT-BT-TT. The influence of the planarity on the effective conjugation length of the molecule can lead to the tuning of HOMO energy level. Inverted OSCs with ZnOx and MoO3 as an electron extraction layer and a hole extraction layer, respectively were fabricated by spin-coating the blend of TT-BT-TT or TF-BT-FT as donor and the fullerene derivative (PC61BM) as acceptor. The TF-BT-FT and TT-BT-TT based BHJ solar cell inverted devices achieved a PCE of 0.49 % with a Voc of 0.71 V, a Jsc of 2.31 mAcm-2 and an FF of 0.29, and PCE of 0.43 % with a Voc of 0.73 V, a Jsc of 1.94 mAcm-2 and an FF of 0.30, respectively. The preliminary photovoltaic performances indicate that the photocurrent and power conversion efficiency were benefited greatly by inserting furan as five-membered heterocycles in small molecules. |
URI: | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/60463 |
全文授權: | 有償授權 |
顯示於系所單位: | 高分子科學與工程學研究所 |
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