Abstract

Quaternary blended organic solar cells utilize four blended material components (one donor plus three acceptors, two donors and two acceptors, or three donors plus one acceptor) as the active layer materials. The use of four material components allows us to have more material selections and more mechanism choices to improve the photon-to-electron conversion efficiency. In this contribution, we present a new case of quaternary material system, that shows 17.1% efficiency obtained by adding IDIC and PC₇₁BM as the guest acceptors of the host binary of PM6:Y6. The lowest unoccupied molecular orbital (LUMO) levels of IDIC and PC₇₁BM are both higher than that of Y6, which is one reason to obtain increased open-circuit voltage (V_oc) in the quaternary device. Upon introduction of IDIC and PC₇₁BM as the acceptor guests, the hole and electron mobilities are both increased, which contributes to the increased short-circuit current-density (J_sc). Effects of the weight ratios of the three acceptor components are investigated, which demonstrates that the increased hole and electron mobilities, the accelerated hole-transfer, and the reduced monomolecular recombination are the factors contributing to the increased J_sc and fill-factor. This case of quaternary device demonstrates the applicability of the quaternary strategy in increasing the device functions and hence the efficiencies in the field of organic photovoltaic cells.

中文翻译：

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以两个较高的LUMO级受体来宾作为四元策略实现的17.1％效率的有机光伏电池

摘要

四元混合有机太阳能电池利用四种混合材料成分（一个施主加三个受体，两个施主和两个受体，或三个施主加一个受体）作为活性层材料。四个材料组件的使用使我们可以选择更多的材料和更多的机制来提高光子到电子的转换效率。在此贡献中，我们提出了一个新的四元材料系统案例，该案例显示了通过添加IDIC和PC ₇₁ BM作为PM6：Y6宿主二进制二进制的宾客受体而获得的17.1％效率。IDIC和PC ₇₁ BM的最低未占用分子轨道（LUMO）均高于Y6，这是获得增加的开路电压（V _{oc的原因之一）}）中的四元数。通过引入IDIC和PC ₇₁ BM作为受主来宾，空穴和电子迁移率均增加，这有助于增加短路电流密度（J _sc）。研究了三种受体组分的重量比的影响，这表明增加的空穴和电子迁移率，加速的空穴传输和减少的单分子重组是导致增加的J _sc和填充因子的因素。四元器件的这种情况证明了四元策略在增加器件功能方面的适用性，从而提高了有机光伏电池领域的效率。