https://scholars.lib.ntu.edu.tw/handle/123456789/76015
標題: | Optimization of the active-layer morphology with a non-halogenic solvent for bulk-heterojunction polymer solar cells | 作者: | Lin, Ching Pan, Wen-Chueh Tsai, Feng-Yu |
關鍵字: | Conjugated polymer; Organic electronics; Organic photovoltaic; Organic semiconductors | 公開日期: | 2010 | 起(迄)頁: | 2643-2647 | 來源出版物: | Synthetic Metals | 摘要: | Polymer solar cells (PSC) based on blended poly(3-hexylthiophene) (P3HT) and [6,6]-phenyl C61 butyric acid methyl ester (PCBM) were fabricated with a non-halogenic solvent - tetralin - as the casting solvent for the active layer, and the morphology of the active layer was optimized by varying the casting conditions to obtain high efficiency and thermal stability from the PSCs. Tetralin as the casting solvent caused excessive P3HT and PCBM aggregations and hence dismal performance [power conversion efficiency (PCE) = 0.5%] due to its low volatility and high dissolution power, which enhanced the plasticizing effect of residual solvent during the formation of the active layer. Accelerated removal of the residual solvent by a vacuum drying treatment greatly reduced the aggregations and improved the PCE to 2.4%, but the improvement was limited because the rapid drying inhibited full developments of continuous charge-transport pathways and of P3HT crystallinity, both of which are critical for charge transport through the device. The desirable morphology - minimal aggregations but high phase continuity and P3HT crystallinity - was obtained with a low-temperature drying process, which limited P3HT/PCBM aggregations and enhanced nucleation of P3HT crystallites, resulting in a finely interconnected P3HT crystal network that provided both large bulk-heterojunction area and facile hole-transport pathways. The resultant PSCs obtained a high PCE of 3.7%, and because of the morphological rigidity of the P3HT crystal network, showed excellent stability for extended duration at elevated temperature. © 2010 Elsevier B.V. All rights reserved. |
URI: | http://ntur.lib.ntu.edu.tw//handle/246246/243831 | DOI: | 10.1016/j.synthmet.2010.10.018 | SDG/關鍵字: | Active Layer; Bulk heterojunction; Butyric acids; Casting conditions; Charge transport; Crystal networks; Crystallinities; Drying process; Elevated temperature; High efficiency; Hole transports; Layer morphology; Low temperatures; Methyl esters; Organic electronics; Organic photovoltaics; Organic semiconductor; Phase continuity; Plasticizing effects; Poly-3-hexylthiophene; Polymer Solar Cells; Power conversion efficiencies; Rapid drying; Residual solvents; Tetralins; Thermal stability; Vacuum drying; Aromatic hydrocarbons; Conversion efficiency; Dissolution; Drying; Esters; Fatty acids; Heterojunctions; Morphology; Optimization; Photovoltaic effects; Solar cells; Solvents |
顯示於: | 材料科學與工程學系 |
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