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Enhancing the Performance of Polymer Solar Cells via Core Engineering of NIR‐Absorbing Electron Acceptors
Advanced Materials ( IF 27.4 ) Pub Date : 2018-03-07 , DOI: 10.1002/adma.201706571
Shuixing Dai 1 , Tengfei Li 1 , Wei Wang 1 , Yiqun Xiao 2 , Tsz-Ki Lau 2 , Zeyuan Li 1 , Kuan Liu 1 , Xinhui Lu 2 , Xiaowei Zhan 1
Affiliation  

In order to utilize the near‐infrared (NIR) solar photons like silicon‐based solar cells, extensive research efforts have been devoted to the development of organic donor and acceptor materials with strong NIR absorption. However, single‐junction organic solar cells (OSCs) with photoresponse extending into >1000 nm and power conversion efficiency (PCE) >11% have rarely been reported. Herein, three fused‐ring electron acceptors with varying core size are reported. These three molecules exhibit strong absorption from 600 to 1000 nm and high electron mobility (>1 × 10−3 cm2 V−1 s−1). It is proposed that core engineering is a promising approach to elevate energy levels, enhance absorption and electron mobility, and finally achieve high device performance. This approach can maximize both short‐circuit current density ( JSC) and open‐circuit voltage (VOC) at the same time, differing from the commonly used end group engineering that is generally unable to realize simultaneous enhancement in both VOC and JSC. Finally, the single‐junction OSCs based on these acceptors in combination with the widely polymer donor PTB7‐Th yield JSC as high as 26.00 mA cm−2 and PCE as high as 12.3%.

中文翻译:

通过近红外吸收电子受体的核心工程提高聚合物太阳能电池的性能

为了利用基于硅的太阳能电池等近红外(NIR)太阳光子,已进行了大量研究工作,以开发具有强NIR吸收能力的有机供体和受体材料。但是,很少有光响应延伸到> 1000 nm且功率转换效率(PCE)> 11%的单结有机太阳能电池(OSC)。在本文中,报道了三种具有不同核尺寸的稠环电子受体。这三个分子在600至1000 nm处显示出强吸收性,并具有高电子迁移率(> 1×10 -3 cm 2 V -1 s -1)。有人提出,核心工程学是一种提高能量水平,增强吸收和电子迁移率并最终实现高器件性能的有前途的方法。这种方法可以同时使短路电流密度(J SC)和开路电压(V OC)最大化,这与通常无法同时提高V OCJ的常用端基工程不同。SC。最后,基于这些受体的单结OSC与广泛的聚合物供体PTB7-Th结合产生的J SC高达26.00 mA cm -2,PCE高达12.3%。
更新日期:2018-03-07
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