Control of molecular orientations by sequential deposition to enhance organic photovoltaic performance
Control of molecular orientations by sequential deposition to enhance organic photovoltaic performance
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DOI：
10.1016/j.matchemphys.2022.125849
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发表时间：
2022-02
影响因子：
4.6
通讯作者：
Kyohei Nakano;Fengkun Chen;Y. Kaji;K. Tajima
中科院分区：
文献类型：
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作者：
Kyohei Nakano;Fengkun Chen;Y. Kaji;K. Tajima
通过涂覆供体和受体的混合溶液制备的本体异质结（BHJ）结构已用于高效的有机光致发光（OPV），但这种方法几乎不允许控制膜中的分子取向。在这里，我们表明，顺序沉积策略，其中的分子受体顺序沉积在一个原始的聚合物供体膜，可靠地控制在所得的BHJ膜的分子取向。椭圆偏振光谱表明，与混合BHJ膜相比，施主和受主都采用了更高的取向度，其中π平面平行于膜平面。与混合BHJ膜相比，顺序沉积的膜将OPV的功率转换效率提高了30%，表明这种策略对于改善OPV性能的有用性。
Bulk heterojunction (BHJ) structures prepared by coating mixed solutions of a donor and an acceptor have been used for efficient organic photovoltaics (OPVs), but this approach allows little control of the molecular orientations in the films. Herein we show that a sequential deposition strategy, in which the molecular acceptor is deposited sequentially on a pristine polymer donor film, reliably controls the molecular orientations in the resulting BHJ films. Spectroscopic ellipsometry indicates that both the donor and the acceptor adopt higher degrees of orientation with the π-planes parallel to the film plane compared with mixed BHJ films. The sequentially deposited films enhance the power conversion efficiency of OPVs by 30% compared with mixed BHJ films, indicating the usefulness of this strategy for improving OPV performance.