Please use this identifier to cite or link to this item: http://hdl.handle.net/11455/91555
標題: 含5,6-二氟苯並[1,2,5]噻二唑之側鏈型共軛高分子合成及其光伏特性研究
Synthesis of 5,6-Difluorobenzo[1,2,5]thiadiazole Derivative Based Side-Chain Conjugated Polymers for Photovoltaic Solar Cells
作者: Wan-Hua Lee
李婉華
關鍵字: Benzodithiophene
thiophene
triphenylamine
side-chain conjugated polymers
photovoltaic performance
bulk heterojunction cell.
苯並二噻吩
噻吩
三苯胺
側鏈型共軛高分子
異質接面有機太陽能電池
有機光伏元件。
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摘要: 由於共軛高分子能階影響著高分子之可吸收太陽光範圍,以及高分子太陽能電池之開路電壓激子分離能力、及電荷傳輸等光伏性質,所以在高分子主鏈上導入具有強拉電子性之含氟Benzodithiophene (BT-F) 低能隙基團,欲使材料之吸收光譜有效紅位移,兼具低能隙與低HOMO能階的性質。並在高分子主鏈導入由苯胺基團所組成之共軛側鏈,以增加高分子結構平面性,設計成主鏈具有推拉電子特性之雙極性 (bipolar) 結構與側鏈推電子特性之二維 (2D) 型共軛高分子。依據導入不同BT-F含量,分別合成出PBTFA11 、PBTFA12 及PBTFA13三種共軛型高分子,再經由NMR鑑定確認聚合物之BT-F含量。經由 UV-vis 吸收光譜分析,結果顯示 PBTFA11 於薄膜狀態下之主要吸收波長在417.1nm、557.2 nm與717.0 nm,PBTFA12 於薄膜狀態下之主要吸收波長在417.3nm與576.2 nm,PBTFA13 於薄膜狀態下之主要吸收波長在416.2nm與556.6 nm,三者均在可見光區有明顯的吸收,並且隨著BT-F含量增加其吸收波長產生紅位移、吸收範圍變廣。由吸收波長計算出PBTFA11、PBTFA12與 PBTFA13 的能隙分別為1.54、1.59及1.69 eV。此外,藉由原子力徑分析儀觀察共軛高分子與碳六十衍生物PC61BM之複合膜的表面型態。結果顯示高分子與PC61BM均呈現良好奈米尺寸級的相分離,可有效分離與傳遞激子所產生之電子與電洞。在光伏特性上的表現上,以 PBTFA13摻混 PC61BM 比例1:3 (w/w) 表現最佳,電池之開路電壓VOC值爲0.59 V 、電流密度Jsc值爲3.30 mA/cm2 、填充因子FF值爲0.47 及光電轉換效率PCE值爲 0.92 % 。PBTFA13摻混PC71BM比例1:3 (w/w)所製得之電池元件,其光電轉換效率更高達3.02%以上。
In this study, 5,6-difluorobenzo[1,2,5]thiadiazole derivative (BT-F) based conjugated polymers with different content of triphenylamine based pendants were synthesized via stilling coupling reactions. The absorption pecks of PBTFA11 were observed at 417.1, 557.2, and 717.0 nm. The absorption pecks of PBTFA12 were observed at 417.3 and 576.2 nm . In addition, two absorption pecks of PBTFA13 were observed at 416.2 and 556.6 nm. The UV-vis absorptin wavelength was red-shiffed as BT-F cintent was increased. The bandgap energies of PBTFA11,PBTFA12, and PBTFA13 were 1.54,1.59,and 1.69 eV, respectively. A series of bulk heterojuction solar cells based on the active layer of PBTFA11/PC61BM, PBTFA12/PC61BM, and PBTFA13/PC61BM blends were fabricated. The morphologise of polymer/PC61BM blend films were studied by AFM. AFM images indicated that the polymer and PC61BM were phase separated in nanoscale. This is favorable for the charge separation and transefer of the carriers.The power conversion efficiency (PCE) was strongly dependent on the composition of the blends. The PCE values of PBTFA13/PC61BM based solar cells were larger than those of PBTFA11/PC61BM and PBTFA12/PC61BM based solr cells. A power conversion efficiency (PCE) of 0.92%, a short-circuit current density of 3.30mA/cm2 , an open-circuit voltage of 0.59 V , and a fill factor of 0.47 were observed for solar cell based on the active layer PBTFA13/PC61BM (1:3, w/w). The PCE value of PBTFA13 based PSC was further enhanced to 3.02% by using the PBTFA13/PC71BM blend film as photoactive layer.
URI: http://hdl.handle.net/11455/91555
其他識別: U0005-1911201420360500
文章公開時間: 2017-11-20
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