https://scholars.lib.ntu.edu.tw/handle/123456789/397284
標題: | Enhanced thermal stability of organic photovoltaics via incorporating triphenylamine derivatives as additives | 作者: | Chao, Y.-C. Chuang, C.-H. Hsu, H.-L. Wang, H.-J. Hsu, Y.-C. Chen, C.-P. Jeng, R.-J. RU-JONG JENG |
關鍵字: | Crosslinker; Intermolecular interaction; Organic photovoltaic; Thermal stability | 公開日期: | 2016 | 卷: | 157 | 起(迄)頁: | 666-675 | 來源出版物: | Solar Energy Materials and Solar Cells | 摘要: | In this work, we prepared four star-shaped conjugated small molecules, the triphenylamine dithiophene (TBT) derivatives, namely TBT-H, TBT-Br, TBT-OH, and TBT-N3 presenting hydride, bromide, hydroxyl, and azide terminal functional groups, respectively. These TBT derivatives were used as additives in the active layers of organic photovoltaics to investigate the effect of intermolecular interactions (TBT-H, TBT-OH) or crosslinking (TBT-N3, TBT-Br) on the long-term thermal stability of the devices. From analyses of blend film morphologies, and optoelectronic and device performance, we observed significant enhancements in thermal stability during accelerated heating tests at 150 °C for the devices incorporated with the additives TBT-N3 and TBT-Br. These two additives functioned as crosslinkers, and constructed local borders that effectively impeded heat-promoted fullerene aggregation, thereby leading to highly stable morphologies. When compared with corresponding normal devices, the TBT-N3–derived devices based on poly(3-hexylthiophene) exhibited greater stability, with the power conversion efficiency (PCE) remaining as high as 2.5% after 144h at 150 °C. Because of this enhancement, a device based on an amorphous low-bandgap polymer, namely poly(thieno[3,4-b]thiophene-alt-benzodithiophene), with the addition of TBT-N3 was fabricated. We observed a significant improvement in device stability, retaining approximately 60% (from 5.0 to 3.3%) of its initial PCE under accelerated heating (150 °C). In contrast, the PCE of the corresponding normal device decayed to 0.01% of its initial value. © 2016 Elsevier B.V. |
URI: | http://www.scopus.com/inward/record.url?eid=2-s2.0-84984846425&partnerID=MN8TOARS http://scholars.lib.ntu.edu.tw/handle/123456789/397284 |
DOI: | 10.1016/j.solmat.2016.07.041 | SDG/關鍵字: | Bromine compounds; Photovoltaic effects; Stability; Conjugated small molecules; Crosslinker; Intermolecular interactions; Organic photovoltaics; Poly (3-hexylthiophene); Power conversion efficiencies; Thieno[3 ,4-b]thiophene; Triphenylamine derivatives; Thermodynamic stability |
顯示於: | 高分子科學與工程學研究所 |
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