Pyrene-benzo[1,2,5]thiadiazole based conjugated polymers for application in BHJ solar cells
Pyrene-benzo[1,2,5]thiadiazole based conjugated polymers for application in BHJ solar cells
复制标题
基于芘-苯并[1，2，5]噻二唑的共轭聚合物在BHJ太阳能电池中的应用
DOI：
10.1016/j.jscs.2020.04.004
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发表时间：
2020-06-01
影响因子：
5.6
通讯作者：
Lidzey, David G.
中科院分区：
文献类型：
--
作者：
Alqurashy, Bakhet A.;Iraqi, Ahmed;Lidzey, David G.
制备了乙基己氧基功能化芘（P-EH），并通过Stille偶联聚合法与二噻吩基苯并[c]-[1,2,5]噻二唑和二噻吩基苯并[c]-[1,2,5]噻二唑共聚，分别得到了PPEH-DTBT-8和PPEH-DT2BT-8。进行了一项比较研究，以评估用噻吩取代噻吩重复单元对共轭聚合物性能的影响。PPEH-DT2BT-8在芘和苯并噻唑重复单元之间有邻噻吩间隔，其光学和电化学带隙比PPEH-DT2BT-8窄；结合了促进供电子和接受电子部分之间分子内电荷转移的双噻吩间隔单元的结果。PPEH-DTBT-8和PPEH-DT2BT-8的深HOMO水平分别为-5.54和-5.50 eV。该聚合物具有良好的热稳定性，降解温度在310℃以上。采用PC70BM为受体制备体异质结（BHJ）光伏器件，研究了两种聚合物的光伏性能。PPEH-DTBT-8和PPEH-DT2BT-8的效率分别为0.33%和1.83%。PPEH-DT2BT-8的更高效率可归因于FF和J（sc）值的大幅提高。(C) 2020作者。由Elsevier B.V.代表沙特国王大学出版。
Ethylhexyloxy-functionalised pyrene (P-EH) was prepared and copolymerised with both dithienyl-benzo[c]-[1,2,5]thiadiazole and dibithiophenyl-benzo[c]-[1,2,5]thiadiazole via a Stille coupling polymerisation method to yield PPEH-DTBT-8 and PPEH-DT2BT-8, respectively. A comparative study was conducted to assess the impact of substituting thiophene for bithiophene repeat units upon the resulting properties of the conjugated polymers. PPEH-DT2BT-8 which has bithiophene spacers between pyrene and benzothiadiazole repeat units, exhibited a narrower optical and electrochemical band gap relative to PPEH-DTBT-8; a consequence of the incorporating bithiophene spacer units which promote intramolecular charge transfer between the electron donating and electron accepting moieties. Both PPEH-DTBT-8 and PPEH-DT2BT-8 showed deep HOMO levels of -5.54 and -5.50 eV, respectively. The polymers possess good thermal stabilities with degradation temperatures in excess of 310 degrees C. The photovoltaic performance of the two polymers was studied by fabricating bulk heterojunction (BHJ) photovoltaic devices using PC70BM as the acceptor. PPEH-DTBT-8 and PPEH-DT2BT-8 demonstrated efficiencies of 0.33 and 1.83%, respectively. The higher efficiency of PPEH-DT2BT-8 can be attributed to vastly improved FF and J(sc) values. (C) 2020 The Author(s). Published by Elsevier B.V. on behalf of King Saud University.