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Achieving Balanced Crystallization Kinetics of Donor and Acceptor by Sequential‐Blade Coated Double Bulk Heterojunction Organic Solar Cells
Advanced Energy Materials ( IF 24.4 ) Pub Date : 2020-06-11 , DOI: 10.1002/aenm.202000826 Yilin Wang 1 , Xiaohui Wang 1 , Baojun Lin 1 , Zhaozhao Bi 1 , Xiaobo Zhou 1 , Hafiz Bilal Naveed 1 , Ke Zhou 1 , Hongping Yan 2 , Zheng Tang 3 , Wei Ma 1
Advanced Energy Materials ( IF 24.4 ) Pub Date : 2020-06-11 , DOI: 10.1002/aenm.202000826 Yilin Wang 1 , Xiaohui Wang 1 , Baojun Lin 1 , Zhaozhao Bi 1 , Xiaobo Zhou 1 , Hafiz Bilal Naveed 1 , Ke Zhou 1 , Hongping Yan 2 , Zheng Tang 3 , Wei Ma 1
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Sequential deposition has great potential to achieve high performance in organic solar cells due to the resulting well‐controlled vertical phase separation. In this work, double bulk heterojunction organic solar cells are fabricated by sequential‐blade cast in ambient conditions. Probed by the in situ grazing incidence X‐ray diffraction and in situ UV–vis absorption measurements, the seq‐blade system exhibits a different tendency from each of the binary films during the film formation process. Due to the extensive aggregation of FOIC, the binary PBDB‐T:FOIC film displays a strong and large phase separation, resulting in low current density (J sc) and unsatisfactory power conversion efficiency. In the seq‐blade cast system, the bottom layer PBDB‐T:IT‐M produces many crystal nuclei for the top layer PBDB‐T:FOIC, so the PBDB‐T molecules are able to crystallize easily and quickly. Balanced crystallization kinetics between polymer and small molecule and an ideal percolation network in the film are observed. In addition, the balanced crystallization kinetics are favorable toward realizing lower recombination loss through charge transport processes.
中文翻译：
通过顺序叶片涂层双体异质结有机太阳能电池实现供体和受体的平衡结晶动力学
由于产生的垂直相分离得到很好的控制，顺序沉积在有机太阳能电池中具有实现高性能的巨大潜力。在这项工作中，双块异质结有机太阳能电池是在环境条件下通过顺序叶片浇铸制成的。通过原位掠入射X射线衍射和原位UV-vis吸收测量来探究，seq-blade系统在成膜过程中呈现出与每个二元膜不同的趋势。由于FOIC的广泛聚集，二元PBDB‐T：FOIC膜显示出强而大的相分离，从而导致低电流密度（J sc）和不令人满意的电源转换效率。在seq-blade铸造系统中，底层PBDB-T：IT-M为顶层PBDB-T：FOIC产生许多晶核，因此PBDB-T分子能够轻松快速地结晶。观察到聚合物与小分子之间平衡的结晶动力学以及薄膜中的理想渗滤网络。另外，平衡的结晶动力学有利于通过电荷传输过程实现较低的复合损失。
更新日期：2020-07-28
中文翻译：
通过顺序叶片涂层双体异质结有机太阳能电池实现供体和受体的平衡结晶动力学
由于产生的垂直相分离得到很好的控制，顺序沉积在有机太阳能电池中具有实现高性能的巨大潜力。在这项工作中，双块异质结有机太阳能电池是在环境条件下通过顺序叶片浇铸制成的。通过原位掠入射X射线衍射和原位UV-vis吸收测量来探究，seq-blade系统在成膜过程中呈现出与每个二元膜不同的趋势。由于FOIC的广泛聚集，二元PBDB‐T：FOIC膜显示出强而大的相分离，从而导致低电流密度（J sc）和不令人满意的电源转换效率。在seq-blade铸造系统中，底层PBDB-T：IT-M为顶层PBDB-T：FOIC产生许多晶核，因此PBDB-T分子能够轻松快速地结晶。观察到聚合物与小分子之间平衡的结晶动力学以及薄膜中的理想渗滤网络。另外，平衡的结晶动力学有利于通过电荷传输过程实现较低的复合损失。
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