本研究以 CDT 為單元，開發出新核心：雙併 CDT 單元的DCDT，之後將此新核心分別接上末端基拉電子基團為羅丹寧 (Rh) 與茚酮 (IN)，製備出兩個新的可溶性有機光伏打太陽能電池材料：INDCDT-b16 (1) 與 RhDCDT-b16 (2)，並與實驗室開發的 INBCDT-b16 與 RhBCDT-b16 比較。多併環噻吩之核心有助於電荷轉移進而增加載子移動率，於多環的核心架構中引入分支的碳鏈以確保分子之溶解度，並避免元件製備成膜時分子之堆疊嚴重。 利用 UV-vis 探討此兩核心之共軛性差異，併環 DCDT 相較 BCDT 的確有更好的共軛性，使 DCDT 有更強的 ICT 效應，同時接上較強拉電子之末端基團 IN 相較 Rh 有明顯的紅位移。利用 DPV 探討所開發分子之 HOMO 與 LUMO能階之差異，相較於 Rh，在接上較強拉電子之末端基團 IN 後，HOMO 與 LUMO 能階都有明顯的下降。此四新材料之OPVs元件性質仍在優化中。 最後，藉由改變DCDT核心長碳鏈長度，以調整此系列分子之溶解度與分子排列性，開發出兩個新的 INDCDT-8 (3) 與 INDCDT-b8 (4) 衍生物，進而可研究不同鏈長對元件效能的影響。 ;One CDT derivative, DCDT, was served as a central core and were end-capped with electron withdrawing groups, such as dicyanomethylene indanone (IN) or rhodamine (Rh). Via knoevenagel condensation, two new materials INDCDT-b16 (1) and RhDCDT-b16 (2) were prepared and compared to INBCDT-b16 and RhBCDT-b16. The optical properties of these new OPVs were characterized by UV-vis and electrochemical properties (HOMO and LUMO) were characterized by DPV. With better conjugation, the fused DCDTs with more red-shift Uv-Vis absorption and exhibit stronger intramolecular transfer effect than their BCDT analogs. In comparison with Rh-end capping unit, the IN- derivative exhibit lower HOMO and LUMO. Two small molecules based on DCDT with different alkyl chains, INDCDT-8 (3) and INDCDT-b8 (4), were synthesized and characterized for comparison. Currently, the molecular modification and the OPV device optimization of these new compounds are undergoing.
