本文選題：烷硫基側(cè)鏈 + 苯并二噻吩　； 參考：《南京理工大學(xué)》2017年碩士論文

【摘要】：近年來(lái),聚合物太陽(yáng)能電池的能量轉(zhuǎn)換效率(PCEs)已經(jīng)突破11%,展現(xiàn)出了強(qiáng)大的應(yīng)用前景。聚合物的側(cè)鏈工程可以有效調(diào)控其光伏性能,引入不同的烷基鏈長(zhǎng)度或構(gòu)型對(duì)聚合物材料的物化性質(zhì)、與受體材料共混形貌等有著重大的影響。本論文中,通過(guò)在電子供體單元上引入不同的烷硫基鏈,成功合成了 7個(gè)D-A型共軛聚合物,并對(duì)其熱穩(wěn)定性,光學(xué)性質(zhì),電化學(xué)性質(zhì),結(jié)晶性質(zhì)和光伏性能進(jìn)行了系統(tǒng)性地研究。(1)為了研究烷硫基側(cè)鏈對(duì)聚合物的性能影響,我們先合成了一系列具有不同長(zhǎng)度的烷硫基側(cè)鏈二維苯并二噻吩(BDTT-DS)供體單元,將其與電子受體單元4,7-雙(5-溴-2-噻吩基)-5,6-二氟苯并[c][1,2,5]噻二唑(BTff)交替共聚得到四個(gè)具有較窄帶隙的共軛聚合物 PBDTT-DS1-BTff、PBDTT-DS2-BTff、PBDTT-DS3-BTff和 PBDTT-DS4-BTff。通過(guò)研究發(fā)現(xiàn),四個(gè)聚合物表現(xiàn)出不同的最大光吸收波長(zhǎng),表明它們具有不同的聚集行為,并且兩個(gè)烷硫基鏈的引入,使得聚合物具有較低的HOMO能級(jí)(-5.50 eV),致使基于它們的器件有較高的開(kāi)路電壓(VOC);結(jié)果表明合適的烷硫基側(cè)鏈有益于聚合物的光伏性能的提高,在本章中,基于聚合物BDTT-DS2-BTff的器件效率最優(yōu),其能量轉(zhuǎn)換效率(PCE)為5.82%,其中開(kāi)路電壓(VOC)、短路電流密度(Jsc)和填充因子(FF)分別為0.92 V、11.06 mA/cm~2和57.2%。(2)以4,7-雙溴-2-(2-乙基己基)-5,6-二氟苯并[d][1,2,3]三氮唑(FBTz)為電子受體單元,與含有不同烷硫基側(cè)鏈的苯并[1,2-b:4,5-b']二噻吩供體單元交替聚合,得到聚合物 PBDTT-DS2-FBTz、PBDTT-DS4-FBTz 和 PBDTTs-FBTz。研究發(fā)現(xiàn),這種共聚物具有較寬的光學(xué)帶隙(～1.90 eV),且表現(xiàn)出良好的溶解性和結(jié)晶性能。不經(jīng)過(guò)任何器件優(yōu)化,基于該三個(gè)聚合物制備的電池器件均具有較高的開(kāi)路電壓(1.00V),且基于聚合物PBDTTs-FBTz的器件效率最優(yōu),其PCE為2.43%,其中VOC為1.01 V,JSC為 6.40 mA/cm~2,FF 為 38.0%。
[Abstract]:In recent years, the energy conversion efficiency of polymer solar cells (PCEs) has broken through 11, showing a strong application prospects.The side chain engineering of polymer can effectively control its photovoltaic performance. The introduction of different alkyl chain length or configuration has great influence on the physical and chemical properties of polymer materials and the morphology of polymer blends with acceptor materials.In this paper, seven D-A conjugated polymers have been successfully synthesized by introducing different alkanthiyl chains into the electron donor unit, and their thermal stability, optical properties and electrochemical properties have been investigated.In order to study the effect of alkanesulfide side chains on the properties of polymers, a series of 2-D benzodithiophene BDTT-DSs with different lengths were synthesized.It is found that the four polymers exhibit different maximum light absorption wavelengths, indicating that they exhibit different aggregation behaviors and the introduction of two alkyl thio chains.The polymer has a lower HOMO energy level of -5.50 EV, resulting in a higher open circuit voltage of the devices based on them. The results show that the appropriate alkane sulfur side chain is beneficial to the improvement of the photovoltaic performance of the polymer, and in this chapter,The device efficiency is optimal based on polymer BDTT-DS2-BTff.It is found that the copolymer has a wide optical band gap of 1.90 EV, and shows good solubility and crystallinity.
【學(xué)位授予單位】：南京理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類(lèi)號(hào)】：O631.3;TM914.4

【參考文獻(xiàn)】

相關(guān)期刊論文 前2條

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本文編號(hào)：1744957