Correlation of the pi-conjugation chain length and the property and photovoltaic performance of benzo[1,2-b:4,5-b ']dithiophene-cored A-pi-D-pi-A type molecules
文献类型：期刊论文
| 作者 | Wang, LL(王立磊); Zhang, Y; Yin, N; Lin, Y; Gao, W(高威); Luo, Q(骆群); Tan, HW; Yang, HB; Ma, CQ(马昌期) |
| 刊名 | SOLAR ENERGY MATERIALS AND SOLAR CELLS
 |
| 出版日期 | 2016 |
| 卷号 | 157 |
| 通讯作者 | Yang, HB ; Ma, CQ(马昌期) |
| 英文摘要 | A-pi-D-pi-A type conjugated small molecules (COOP-nHT-BDT (n=1-4)) with a benzo[1,2-b:4,5-b']dithiophene (BDT) as the electron-donating core, 2-cyano-3-octyloxy-3-oxo-1-propenyl (COOP) as the terminal electron-accepting unit, and two regioregular oligo(3-hexylthiophene) (nHT) as pi-conjugated bridges were synthesized and characterized. TGA results confirmed that all these compounds are thermally stable with decomposition temperatures higher than 340 degrees C. Broad absorption bands over 350 to 600 nm with small optical band gaps (E-g(opt)) of 1.9-1.8 eV were measured for these compounds. Cyclic voltammetry measurements indicated that HOMO energy level of these COOP-nHT-BDTs increases slightly with the increase of nHT chain length, whereas all these compounds display similar LUMO energy level of -3.60 eV. These were supported by density function calculation results, that electronic wave functions of the HOMO orbitals are delocalized over the BDT-core with the adjacent 2-3 thiophene units, whereas the electronic wave functions of the LUMO orbital are mostly localized on the terminal COOP unit with 1-2 thiophene units. Gradually increasing of the photovoltaic performance was found for these compounds with the increase of the pi-bridge chain length, and the COOP-4HT-BDT/PC71BM (2:1, w/w) based device displayed a best power conversion efficiency of 5.14% with an open circuit voltage of 0.90 V, a short circuit current of 8.27 mA cm(-2) land a fill factor of 0.69. A positive correlation between long-term stability of PCE and chain length was also obtained. COOP-4HT-BDT based devices showed the highest device stability with only 15% decay after 320 h continuous illumination. (C) 2016 Elsevier B.V. All rights reserved. |
| 关键词[WOS] | ORGANIC SOLAR-CELLS ; PROCESSED SMALL-MOLECULE ; BENZODITHIOPHENE UNIT ; CONVERSION EFFICIENCY ; END-GROUPS ; SUBSTITUTION ; THIOPHENE ; OLIGOMERS |
| 收录类别 | SCI ; EI |
| 语种 | 英语 |
| WOS记录号 | WOS:000384391700099 |
| 源URL | [http://ir.sinano.ac.cn/handle/332007/4672]  |
| 专题 | 苏州纳米技术与纳米仿生研究所_印刷电子学部_马昌期团队 |
| 推荐引用方式 GB/T 7714 | Wang, LL,Zhang, Y,Yin, N,et al. Correlation of the pi-conjugation chain length and the property and photovoltaic performance of benzo[1,2-b:4,5-b ']dithiophene-cored A-pi-D-pi-A type molecules[J]. SOLAR ENERGY MATERIALS AND SOLAR CELLS,2016,157. |
| APA | Wang, LL.,Zhang, Y.,Yin, N.,Lin, Y.,Gao, W.,...&Ma, CQ.(2016).Correlation of the pi-conjugation chain length and the property and photovoltaic performance of benzo[1,2-b:4,5-b ']dithiophene-cored A-pi-D-pi-A type molecules.SOLAR ENERGY MATERIALS AND SOLAR CELLS,157. |
| MLA | Wang, LL,et al."Correlation of the pi-conjugation chain length and the property and photovoltaic performance of benzo[1,2-b:4,5-b ']dithiophene-cored A-pi-D-pi-A type molecules".SOLAR ENERGY MATERIALS AND SOLAR CELLS 157(2016). |
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