Post-annealing to recover the reduced open-circuit voltage caused by solvent annealing in organic solar cells
Post-annealing to recover the reduced open-circuit voltage caused by solvent annealing in organic solar cells
复制标题
后退火可恢复有机太阳能电池中因溶剂退火而降低的开路电压
DOI：
10.1039/c6ta00835f
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发表时间：
2016-04
影响因子：
11.9
通讯作者：
Chen, Yiwang
中科院分区：
文献类型：
--
作者：
Zhang, Lin;Meng, Xiangchuan;Ai, Qingyun;Chen, Yiwang
在p-DTS(FBTTh2)2：PC71BM太阳电池中观察到的246 mV的开路电压(VOC)的巨大损失可以通过后退火得到恢复。溶剂退火后，有源层的后续热退火不能实现VOC的完全恢复，这归因于表面形貌、结晶行为和吸收边的微小变化。然而，在完成整个器件的制作后，随后的后退火成功地使VOC恢复到平均225 mV。通过光电流密度(JPH)与有效电压(VJeff)和短路电流(JSC)与光强的关系分析表明，后退火后器件的电荷收集能力增强，双分子复合减少。基于暗J-V特性和拟合曲线，反饱和电流(J0)降低到6.85×10−11A cm−2，表明后退火法比热退火法更有优势，因为它使有源层和背电极之间有更好的界面接触。
The tremendous loss of 246 mV in open-circuit voltage (Voc) upon solvent annealing in p-DTS(FBTTh2)2:PC71BM solar cells that has been observed could be recovered by post-annealing. Following solvent annealing, subsequent thermal annealing of the active layer could not achieve full recovery of Voc, which is attributed to minor variation in morphology, crystalline behavior and absorption edge. However, after completing fabrication of the entire device, subsequent post-annealing succeeded in recovery of Voc to 225 mV on average. Through analysis of photocurrent density (Jph) versus the effective voltage (Veff) and short-circuit current (Jsc) versus light intensity, it is shown that the charge collection ability increased and bimolecular recombination decreased in the device after post-annealing. Based on dark J–V characteristics and fitting curves, the reverse saturation current (J0) value reduced to as low as 6.85 × 10−11 A cm−2, demonstrating that the method of post-annealing has an advantage over thermal annealing, as it leads to better interfacial contact between active layer and back electrode.
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