具腈基小分子有機太陽能電池之優化與紅螢烯薄膜激子動態特性之研究

Abstract

本論文旨有其二，第一部分將介紹藉由合成四個新的施體材料運用於有機太陽能電池元件，其結構施體-施體-受體型小分子。7-(5-(di-p-tolylamino)thiophen-2-yl)benzo[c][1,2,5]thiadiazole-4-carbonitrile (DTCTB), 7-(4-(di-p-tolylamino)phenyl)benzo[c][1,2,5]thiadiazole-4-carbonitrile (DTCPB), 7-(5-(di-p-tolylamino)thiophen-2-yl)benzo[c][1,2,5]oxadiazole-4-carbonitrile (DTCTBO), 及7-(4-(di-p-tolylamino)phenyl)benzo[c][1,2,5]oxadiazole-4-carbonitrile (DTCPBO).，在一系列由混和濃度及膜厚變化之塊材異質混和界面架構下，利用與受體材料碳70混合，我們可得以四個小分子DTCPB, DTCTB, DTCPBO 及 DTCTBO所製成太陽能電池之最佳化功率轉換效率分別為6.55%, 4.40%, 5.98% 及4.65%。 二者， 我們使用暫態螢光之量測，來瞭解5,6,11,12-tetraphenylnaphthacene (rubrene)之單重態分裂(singlet fission)與三重態激子融合(triplet fusion)動態特性。在不同溫度及單重態-單重態滅絕可忽略之前提下，單重態分裂之活化動能可被決定。再者在膜厚較薄之薄膜中，由於空間局限之故，其會表現出較高機率之三重態激子融合速率。

There are two parts in this dissertation. In the first part, we employed four donor-donor-acceptor (D-A-A) configurations molecules, 7-(5-(di-p-tolylamino)thiophen-2-yl)benzo[c][1,2,5]thiadiazole-4-carbonitrile (DTCTB), 7-(4-(di-p-tolylamino)phenyl)benzo[c][1,2,5]thiadiazole-4-carbonitrile (DTCPB), 7-(5-(di-p-tolylamino)thiophen-2-yl)benzo[c][1,2,5]oxadiazole-4-carbonitrile (DTCTBO), and 7-(4-(di-p-tolylamino)phenyl)benzo[c][1,2,5]oxadiazole-4-carbonitrile (DTCPBO) as electron donor materials for organic solar cell applications. By a series of methodical optimization, the highest power conversion efficiencies are 6.55%, 4.40%, 5.98%, 4.65% for DTCPB, DTCTB, DTCPBO and DTCTBO respectively with bulk heterojunction configuration. In the second part of this dissertation, the exciton dynamic of 5,6,11,12-tetraphenylnaphthacene (rubrene) was investigated by transient photoluminescence (TrPL) measurements. With low excitation energy (to avoid singlet-singlet annihilation) at different temperatures, the activation energy of singlet fission (SF) in rubrene thin film can be obtained. We also found that the thinner rubrene exhibited higher fusion rate, which may result from higher probability for non-germinate recombination.