本文關(guān)鍵詞： 聚合物太陽能電池 噻吩-苯-噻吩 吡咯并吡咯二酮 能量轉(zhuǎn)換效率　出處：《湘潭大學》2017年碩士論文　論文類型：學位論文

【摘要】：聚合物太陽能電池因其清潔、溶液可加工和低成本等特點成為全世界科學界研究的熱點。近年來,在多國科研工作者的共同努力下,聚合物本體異質(zhì)結(jié)聚合物太陽能電池(BHJ PSCs)最高的能量轉(zhuǎn)換效率已經(jīng)超過12%。但是,離實現(xiàn)商業(yè)化應(yīng)用還有一定的距離。在此背景下,我們分別設(shè)計合成了三個A-D-A型,三個D-A-D型,以及一系列基于吡咯并吡咯二酮(DPP)的共軛聚合物給體材料,并對目標聚合物的光物理、電化學等性能進行了系統(tǒng)的研究。同時,我們分別制備了基于目標聚合物的BHJ PSCs,并對其光伏性能進行了測試。本論文主要研究內(nèi)容如下:1.以噻吩-苯-噻吩(TBT),吡咯并吡咯二酮(DPP)和側(cè)鏈苯并噻二唑(DTBT)共聚,合成了三個三元無規(guī)共軛聚合物GP1,GP2和GP3,不同烷氧基鏈對聚合物的光物理、電化學及光伏性能的影響進行了系統(tǒng)的研究�；诰哂虚L烷基鏈的聚合物GP1的PSCs表現(xiàn)出較低的Jsc。具有短烷基鏈的聚合物GP3和PC61BM共混表現(xiàn)出較明顯的微相分離和最大的表面粗糙度。GP2具有最合適的烷基鏈,所以它有著最有序的π-π堆積,最寬的吸收光譜和最合適的微相分離形態(tài),因此,基于GP2的BHJ PSCs器件獲得了3.31%的PCE。2.以吡咯并吡咯二酮(DPP)衍生物與烷基取代的苯并二噻吩(BDTT)和噻吩-苯-噻吩(TBT)共聚合成了三個三元無規(guī)共軛聚合物GP4,GP5和GP6。通過調(diào)整BDTT和TBT的比例,聚合物的熱穩(wěn)定性、光物理性質(zhì)、電化學性質(zhì)、π-π堆積距離、層間距以及光伏性能都得到優(yōu)化。經(jīng)過研究發(fā)現(xiàn),隨著TBT含量的增加,聚合物的π-π堆積距離變小,但是HOMO能級增加,這導致聚合物器件表現(xiàn)出高的Jsc和低的Voc�；贕P5的BHJ PSCs器件表現(xiàn)出了較高的Jsc和FF及PCE(4.18%)。3.將苯并二噻吩(BDTT)分別和側(cè)鏈型吡咯并吡咯二酮(TTDPP)及主鏈型吡咯并吡咯二酮(DPP)共聚合成了一系列新的聚合物,并測試了其光物理、電化學及光伏性能。隨著TTDPP含量的增加,聚合物在短波區(qū)域的吸收增強,π-π堆積距離減小,HOMO能級降低,這使聚合物器件得到較高的Voc。最后,基于GP10的器件表現(xiàn)出較高的PCE 4.46%,這一研究結(jié)果表明設(shè)計合成具有兩個不同電子受體單元的無規(guī)三元共聚物是一種平衡Jsc和Voc從而獲得高PCE的有效方法。此外,通過溶劑退火對GP8器件進行優(yōu)化,由于溶劑退火使共混膜進行重組,得到更好的相分離形態(tài),從而得到更高的Jsc和PCE(4.74%)。
[Abstract]:Polymer solar cells have become the focus of scientific research all over the world due to their characteristics of cleanliness, processability and low cost. In recent years, with the joint efforts of researchers from many countries, polymer solar cells have become the focus of scientific research all over the world. The highest energy conversion efficiency of polymer bulk heterojunction polymer solar cell (BHJ PSCs) has exceeded 12. However, there is still a certain distance from commercial application. We have designed and synthesized three A-D-A, three D-A-D, and a series of conjugated polymer donor materials based on pyrrolidine-pyrrolidinone diketone (DPP), and the photophysics of the target polymer. The electrochemical properties were systematically studied. At the same time, we prepared BHJ PSCs based on the target polymer. The photovoltaic properties were tested. The main contents of this thesis are as follows: 1. Copolymerization of thiophene benzene-thiophene (TBTT), pyrrolidine dione (DPP) and side chain benzothiadiazole (DTBTT) was carried out. Three ternary random conjugated polymers GP1GP2 and GP3 were synthesized. The photophysical properties of different alkoxyl chains on the polymers were investigated. The effects of electrochemical and photovoltaic properties were systematically studied. The PSCs based on the polymer GP1 with long alkyl chain showed a lower JSC. The polymer GP3 and PC61BM with short alkyl chain were studied systematically. The blend shows obvious microphase separation and maximum surface roughness. GP2 has the most suitable alkyl chain. So it has the most ordered 蟺-蟺 stacking, the widest absorption spectrum and the most suitable microphase separation form, so. The BHJ PSCs device based on GP2 has obtained 3.31% PCE.2.The derivatives of pyrrolidine-diketone and alkyl substituted benzodithiophene (BDTT) have been obtained. Three ternary random conjugated polymers (GP4) were synthesized by copolymerization with thiophene benzene-thiophene (TBT). GP5 and GP6. By adjusting the ratio of BDTT and TBT, the thermal stability, photophysical properties, electrochemical properties and 蟺-蟺 packing distance of the polymer were studied. The interlayer spacing and photovoltaic properties are optimized. It is found that with the increase of TBT content, the 蟺-蟺 stacking distance of the polymer decreases, but the HOMO energy level increases. This resulted in high Jsc and low Vocabulary in polymer devices, and high Jsc and FF and 4.18 in BHJ PSCs devices based on GP5. A series of new polymers were synthesized by copolymerization of benzodithiophene (BDTT) with side chain pyrrolidine-pyrrolidone (TTDPP) and main chain type of pyrrolidine-pyrrolidone (DPP) respectively. The photophysical, electrochemical and photovoltaic properties of the polymer were tested. With the increase of TTDPP content, the absorption of the polymer in the shortwave region increased, and the 蟺-蟺 packing distance decreased and the Homo energy level decreased. Finally, the GP10 based devices show a higher PCE 4.46%. The results show that the design and synthesis of random terpolymer with two different electron receptor units is an effective way to balance Jsc and Voc in order to obtain high PCE. The GP8 devices were optimized by solvent annealing. Because of the recombination of the blend films by solvent annealing, a better phase separation morphology was obtained, and a higher Jsc and PCE4.74g were obtained.
【學位授予單位】：湘潭大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：O631.3;TM914.4

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相關(guān)期刊論文 前1條

1 Shaoqing Zhang;Long Ye;Wenchao Zhao;Bei Yang;Qi Wang;Jianhui Hou;;Realizing over 10% efficiency in polymer solar cell by device optimization[J];Science China Chemistry;2015年02期

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本文編號：1493126