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Revealing the correlation between charge carrier recombination and extraction in an organic solar cell under varying illumination intensity
Physical Chemistry Chemical Physics ( IF 2.9 ) Pub Date : 2017-09-04 00:00:00 , DOI: 10.1039/c7cp05235a Abhishek Sharma 1, 2, 3, 4, 5 , Mihirsinh Chauhan 4, 6, 7, 8, 9 , Vishal Bharti 1, 2, 3, 4 , Manoj Kumar 4, 7, 8, 10, 11 , Suresh Chand 1, 2, 3, 4 , Brijesh Tripathi 4, 7, 8, 10, 11 , J. P. Tiwari 1, 2, 3, 4
Physical Chemistry Chemical Physics ( IF 2.9 ) Pub Date : 2017-09-04 00:00:00 , DOI: 10.1039/c7cp05235a Abhishek Sharma 1, 2, 3, 4, 5 , Mihirsinh Chauhan 4, 6, 7, 8, 9 , Vishal Bharti 1, 2, 3, 4 , Manoj Kumar 4, 7, 8, 10, 11 , Suresh Chand 1, 2, 3, 4 , Brijesh Tripathi 4, 7, 8, 10, 11 , J. P. Tiwari 1, 2, 3, 4
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The design and fabrication of better excitonic solar cells are the need of the hour for futuristic energy solutions. This designing needs a better understanding of the charge transport properties of excitonic solar cells. One of the popular methods of understanding the charge transport properties is the analysis of the J–V characteristics of a device through theoretical simulation at varied illumination intensity. Herein, a J–V characteristic of a polymer:fullerene based bulk heterojunction (BHJ) organic solar cells (OSCs) of structure ITO/PEDOT:PSS (∼40 nm)/PTB7:PC71BM (∼100 nm)/Al (∼120 nm) is analyzed using one- and two-diode models at varied illumination intensity in the range of 0.1–2.33 Sun. It was found that the double diode model is better with respect to the single diode model and can explain the J–V characteristics of the OSCs correctly. Further, the recombination mechanism is investigated thoroughly and it was observed that fill factor (FF) is in the range of 62.5%–41.4% for the corresponding values of the recombination-to-extraction ratio (θ) varying from 0.001 to 0.023. These findings are attributed to the change in charge transport mechanism from trap-assisted to bimolecular recombination with the variation of illumination intensity.
中文翻译：
揭示了在变化的光照强度下有机太阳能电池中载流子重组与提取之间的相关性
未来的能源解决方案需要更好的激子太阳能电池的设计和制造。此设计需要更好地了解激子太阳能电池的电荷传输特性。理解电荷传输特性的一种流行方法是通过在变化的照明强度下进行理论模拟来分析器件的J – V特性。此处，结构为ITO / PEDOT：PSS（〜40 nm）/ PTB7：PC 71的聚合物：富勒烯基整体异质结（BHJ）有机太阳能电池（OSC）的J – V特性使用一二极管和两二极管模型在0.1–2.33 Sun范围内的不同光照强度下分析BM（〜100 nm）/ Al（〜120 nm）。发现双二极管模型比单二极管模型更好，并且可以正确地解释OSC的J – V特性。此外，对重组机理进行了深入研究，结果发现，相对于0.001到0.023的重组/提取比（θ）值，填充因子（FF）在62.5％–41.4％的范围内。这些发现归因于电荷迁移机制从陷阱辅助到双分子重组的变化，并伴随着照明强度的变化。
更新日期：2017-09-20
中文翻译：
揭示了在变化的光照强度下有机太阳能电池中载流子重组与提取之间的相关性
未来的能源解决方案需要更好的激子太阳能电池的设计和制造。此设计需要更好地了解激子太阳能电池的电荷传输特性。理解电荷传输特性的一种流行方法是通过在变化的照明强度下进行理论模拟来分析器件的J – V特性。此处，结构为ITO / PEDOT：PSS（〜40 nm）/ PTB7：PC 71的聚合物：富勒烯基整体异质结（BHJ）有机太阳能电池（OSC）的J – V特性使用一二极管和两二极管模型在0.1–2.33 Sun范围内的不同光照强度下分析BM（〜100 nm）/ Al（〜120 nm）。发现双二极管模型比单二极管模型更好，并且可以正确地解释OSC的J – V特性。此外，对重组机理进行了深入研究，结果发现，相对于0.001到0.023的重组/提取比（θ）值，填充因子（FF）在62.5％–41.4％的范围内。这些发现归因于电荷迁移机制从陷阱辅助到双分子重组的变化，并伴随着照明强度的变化。
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