Thermoelectric Performance of Donor–Acceptor–Donor Conjugated Polymers Based on Benzothiadiazole Derivatives
Thermoelectric Performance of Donor–Acceptor–Donor Conjugated Polymers Based on Benzothiadiazole Derivatives
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DOI：
10.1007/s11664-014-3490-x
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发表时间：
2015-06
影响因子：
2.1
通讯作者：
Shouli Ming;Shijie Zhen;Kaiwen Lin;Li Zhao;Jingkun Xu;Baoyang Lu;Liangying Wang;Jinhua Xiong;Zhengzhou Zhu
中科院分区：
文献类型：
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作者：
Shouli Ming;Shijie Zhen;Kaiwen Lin;Li Zhao;Jingkun Xu;Baoyang Lu;Liangying Wang;Jinhua Xiong;Zhengzhou Zhu
供体-受体-供体共轭聚合物比其它热电有机材料优越上级，因为它更容易改变它们的结构以减小导带和价带之间的带隙，这对于具有高塞贝克系数的热电材料是期望的。尽管如此，给体-受体-给体共轭聚合物的热电性能的研究很少。在这项研究中，四个低能带隙的供体-受体-供体共轭聚合物，聚（4，7-双（2，3-二氢噻吩并[3，4-B][1，4]二恶英-5-基）苯并[c][1，2，5]噻二唑）（PEBTE），聚（4，7-双（2，3-二氢噻吩并[3，4-B][1，4]二恶英-5-基）苯并[c][1，2，5]硒二唑）（PEBSeE），聚（4，7-双（2，3-二氢噻吩并[3，4-B][1，4]二恶英-5-基）-[1，2，5]噻二唑并[3，4-c]吡啶）（PEPTE），和聚（4，7-双（2，3-二氢噻吩并[3，4-B][1，4]二恶英-5-基）-[1，2，5]硒二唑并[3，4-c]吡啶）（PEPSeE）（2，3-二氢噻吩并[3，4-B][1，4]二恶英-5-基）苯并[c][1，2，5]噻二唑（EBTE），4，7-双（2，3-二氢-噻吩并[3，4-B][1，4]二恶英-5-基）苯并[c][1，2，5]硒二唑（EBSeE），4，7-双（2，3-二氢噻吩并[3，4-B][1，4]二恶英-5-基）-[1，2，5]噻二唑并[3，4-c]吡啶（EPTE）和4，7-双（2，3-二氢噻吩并[3，4-B][1，4]二恶英-5-基）-[1，2，5]硒二唑并[3，4-c]吡啶（EPSeE）的热电性能。与聚硒吩相比，PEBTE和PEBSeE在室温下具有较高的电导率（10−1- 101 S cm−1），但塞贝克系数较低（14.0μV K−1）。未来的工作重点可能是处理这些给体-受体-给体聚合物，以提高其电导率和塞贝克系数，并进一步研究其热电性能。
Donor–acceptor–donor conjugated polymers are superior to other thermoelectric organic materials because it is much easier to modify their structure to reduce the bandgap between the conduction and valence bands, which is desirable for thermoelectric materials with high Seebeck coefficients. Despite this, studies of the thermoelectric performance of donor–acceptor–donor conjugated polymers are rare. In this study, four low-bandgap donor–acceptor–donor conjugated polymers, poly(4,7-bis(2,3-dihydrothieno[3,4-b][1,4] dioxin-5-yl)benzo[c][1,2,5]thiadiazole) (PEBTE), poly(4,7-bis(2,3-dihydrothieno[3,4-b][1,4]dioxin-5-yl)benzo[c][1,2,5]selenadiazole) (PEBSeE), poly (4,7-bis(2,3-dihydrothieno[3,4-b][1,4]dioxin-5-yl)-[1,2,5]thiadiazolo [3,4-c] pyridine) (PEPTE), and poly(4,7-bis(2,3-dihydrothieno[3,4-b][1,4]dioxin-5-yl)-[1,2,5]selenadiazolo[3,4-c]pyridine) (PEPSeE), were deposited by electrochemical polymerization of 4,7-bis(2,3-dihydrothieno[3,4-b][1,4]dioxin-5-yl)benzo[c][1,2,5]thiadiazole (EBTE), 4,7-bis(2,3-dihydro-thieno[3,4-b][1,4] dioxin-5-yl)benzo[c][1,2,5]selenadiazole (EBSeE), 4,7-bis(2,3-dihydrothieno [3,4-b][1,4]dioxin-5-yl)-[1,2,5]thiadiazolo[3,4-c] pyridine (EPTE) and 4,7-bis (2,3-dihydrothieno[3,4-b][1,4]dioxin-5-yl)-[1,2,5] selenadiazolo[3,4-c]pyridine (EPSeE), respectively and their thermoelectric performance was investi- gated. Compared with polyselenophenes, PEBTE and PEBSeE in pressed pellets had higher electrical conductivity (10−1–101S cm−1) but lower Seebeck coefficient (14.0μV K−1) at room temperature. Future work may focus on treatment of these donor–acceptor–donor polymers to improve their electrical conductivity and Seebeck coefficient, and further investigation of their thermoelectric performance.