Organic photovoltaic cells (OPVs) have been investigated for a long time, and practical realizations have been also in progress due to their high photovoltaic performance over 12%. In this study, we fabricated normal OPVs and investigated the reason of an improved optical-to-electrical conversion efficiency by annealing the MoOx layer. The photoconversion efficiency was improved up to 5.65% from 2.05% after annealing at 160 style="color:#374051;font-family:" font-size:14px;text-align:center;white-space:normal;"="">°C for 5 min, and the external quantum efficiency also increased for all the measurement wavelength ranging from 300 to 900 nm. Especially, the short circuit current density increased among photovoltaic parameters. The carrier transport resistance of photoactive layer was found to be reduced by evaluating the impedance measurement. These results indicate that defects at the MoOx/organic interface were successfully reduced by the thermal annealing process of MoOx layer. The efficient carrier transport was realized for the annealed-device, resulting in the high device performance. In addition, the relaxation and electron recombination times were also reduced by the annealing process, which lead to the improved photovoltaic performance.
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机译:对有机光伏电池(OPV)进行了长期的研究,由于其超过12%的高光伏性能,实际的实现也正在进行中。在这项研究中,我们制造了普通的OPV,并研究了通过对MoO x sub>层进行退火来提高光电转换效率的原因。在160 style =“ color:#374051; font-family:” font-size:14px; text-align:center; white-space:normal;“下退火后,光转换效率从2.05%提高到5.65%。 =“”>° span> C 5分钟,并且在300至900 nm范围内的所有测量波长处,外部量子效率也均增加,尤其是光伏参数之间的短路电流密度增加。结果表明,通过MoO x sub>的热退火工艺可以成功地减少MoO x sub> /有机界面的缺陷。退火后的器件实现了有效的载流子传输,从而提高了器件的性能;此外,退火工艺还减少了弛豫和电子复合的时间,从而改善了光伏性能。
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