本文選題：三苯胺 + 苯并噻二唑　； 參考：《大連理工大學》2016年碩士論文

【摘要】：有機太陽能電池由于其顯著的優(yōu)點,比如成本低、質(zhì)量輕以及機械靈活性引起了廣泛的研究興趣。目前,基于溶液可處理的有機小分子體異質(zhì)結(jié)光伏器件的最大效率已超過10%。對于大多數(shù)有機小分子給體材料,按對稱性其分子結(jié)構(gòu)可分為對稱型和不對稱型。聚合物有機太陽能電池給體材料的單體多為D-A不對稱結(jié)構(gòu),這類分子具有高效的分子內(nèi)電荷轉(zhuǎn)移,但是這類分子往往沒有足夠的光吸收能力。為了拓寬光譜吸收,進而提高光電轉(zhuǎn)化效率,需要利用多功能性基團修飾來設計新型分子。本論文報道了BTO和BTF兩個系列共8個D-A1-A2型不對稱結(jié)構(gòu)的有機小分子給體材料。在這些分子中,采用三苯胺作給電單元(D),含烷氧鏈的苯并噻二唑(BTO)和含雙氟的苯并噻二唑(BTF)分別作吸電單元(A1),給電單元和吸電單元之間分別以苯基、苯乙烯基、苯乙炔基和2-苯基丙烯氰基作橋鍵構(gòu)成基本的D-π-A1結(jié)構(gòu)。為了改善材料的光譜吸收能力,引入另一個吸電單元(A2)對氰基苯基延長分子結(jié)構(gòu),延伸出8個D-A1-A2型分子。我們對BTO和BTF系列材料進行高斯理論計算、紫外-可見光譜吸收和循環(huán)伏安測試以及制作成溶液可處理的體異質(zhì)結(jié)器件,探究苯并噻二唑核上不同的取代基及不同的橋鍵對材料光物理及光電性能的影響。測試結(jié)果表明：1)兩個系列材料由于引入苯并噻二唑強吸電基使其具有較低的HOMO能級,均獲得較高的開路電壓,達到0.9V以上。2)苯并噻二唑核上引入雙氟使BTF系列材料的HOMO能級進一步降低,與BTO系列材料相比,其對應材料的開路電壓略有提高。3)苯并噻二唑核上引入烷氧鏈使BTO系列材料在氯仿溶液中具有良好的溶解性因而具有良好的成膜性,有效地改善了短路電流和填充因子。4)橋鍵主要影響材料的HOMO能級,對LUMO能級影響較小,以2-苯基丙烯氰基為橋鍵的材料具有較低的HOMO能級,因而基于材料TPACNBTFCN為給體的器件獲得了1.01V的開路電壓：基于TPACNBTOCN為給體的器件經(jīng)溶劑蒸汽退火處理后同時具有高開路電壓和高短路電流,表現(xiàn)出最優(yōu)的光電轉(zhuǎn)化效3.03％,Jsc=9.48 mA.cm-2,Voc=1.00V,FF=0.32。
[Abstract]:Organic solar cells have attracted extensive research interest due to their significant advantages, such as low cost, light mass and mechanical flexibility. At present, the maximum efficiency of organic small molecular heterojunction photovoltaic devices based on solution treatment has exceeded 10. For most organic small molecular donor materials, their molecular structures can be divided into symmetric and asymmetric types according to symmetry. Most of the monomers of polymer organic solar cell donors are D-A asymmetric. These molecules have highly efficient intramolecular charge transfer, but these molecules often do not have sufficient optical absorption capacity. In order to broaden the spectral absorption and improve the photoelectric conversion efficiency, multifunctional group modification is needed to design novel molecules. In this paper, two series of BTO and BTF organic small molecular donors with D-A1-A2 asymmetric structure are reported. Among these molecules, trianiline was used as the feed unit, benzothiadiazolium containing alkoxy chain (BTOO) and difluorinated benzothiadiazolium (BTF) as the absorbent unit, respectively, and phenyl and styrene groups were used between the feeding unit and the absorbent unit, respectively. The basic structure of D- 蟺-A _ 1 is formed by using phenylacetylene and 2-phenylpropene cyanide as bridge bonds. In order to improve the spectral absorption ability of the material, another electric-absorbent unit (A2) was introduced to prolong the molecular structure of cyanophenyl, and eight D-A1-A2 type molecules were extended. We have made theoretical calculations of BTO and BTF series, UV-Vis spectral absorption and cyclic voltammetry, and fabricated bulk heterojunction devices that can be treated in solution. The effects of different substituents and bridge bonds on the photophysical and optoelectronic properties of benzothiadiazole were investigated. The test results show that the two series of materials have higher open circuit voltage due to the introduction of a strong absorbent group of benzothiadiazole, which has a lower HOMO energy level. The introduction of difluorine into the nucleus of benzo-thiadiazole (> 0.9V) further reduced the HOMO energy level of BTF series, compared with that of BTO series materials. The open-circuit voltage of the corresponding material increased slightly. 3) the introduction of alkoxy chain to the nucleation of benzothiadiazole made the BTO series materials have good solubility in chloroform solution and thus good film formation. The short circuit current and filling factor. 4) bridge bond mainly affect the HOMO energy level of the material, and have little effect on the LUMO energy level. The material with 2-phenylpropene cyanide as bridge bond has lower HOMO energy level. Therefore, the device based on material TPACNBTFCN as donor obtains an open circuit voltage of 1.01V: the device based on TPACNBTOCN has high open circuit voltage and high short circuit current after solvent steam annealing, which shows the optimum photoelectric conversion efficiency of 3.03g / s 9.48mA.cm-2Vocn 1.00V / FF0.32.
【學位授予單位】：大連理工大學
【學位級別】：碩士
【學位授予年份】：2016
【分類號】：O626

【參考文獻】

相關期刊論文 前1條

1 郭軍;李博;胡來歸;;有機薄膜太陽能電池[J];材料導報;2011年17期

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本文編號：1777809