Structure鈥揚roperty Correlation: A Comparison of Charge Carrier Kinetics and Recombination Dynamics in All-Polymer Solar Cells

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• 作者：Yu Jin Kim ; Woongsik Jang ; Dong Hwan Wang ; Chan Eon Park
• 刊名：Journal of Physical Chemistry C
• 出版年：2015
• 出版时间：November 25, 2015
• 年：2015
• 卷：119
• 期：47
• 页码：26311-26318
• 全文大小：595K
• ISSN：1932-7455

文摘

We report a comparison of charge carrier kinetics and recombination dynamics correlated with the device performances of PBDTTT-C and PBDTTT-CT in nonfullerene P(NDI2OD-T2) solar cells. The nanoscale morphological characteristics are found to be remarkably different for these two polymers in all-polymer bulk heterojunction (BHJ) blends. Important insights into the carrier dynamics and crystalline packing features of these different donor materials are provided in detail. The higher device performance of the PBDTTT-CT:P(NDI2OD-T2) device [2.78% compared to 1.56% for the PBDTTT-C:P(NDI2OD-T2) cell] is shown to result from efficient charge generation and faster carrier separation, reducing nongeminate recombination during charge collection, which is attributed to the perfect intermixing between the donor and acceptor polymer networks.