Reducing the effciency-stability-cost gap of organic photovoltaics with highly effcient and stable small molecule acceptor ternary solar cells
Reducing the effciency-stability-cost gap of organic photovoltaics with highly effcient and stable small molecule acceptor ternary solar cells
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DOI：
10.1038/nmat4797
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发表时间：
2017-03-01
期刊：
影响因子：
41.2
通讯作者：
McCulloch, Iain
中科院分区：
文献类型：
--
作者：
Baran, Derya;Ashraf, Raja Shahid;McCulloch, Iain
有机光伏组件的技术部署需要在保持低材料成本的同时提高器件的光转换效率和稳定性。在这里，我们使用三元方法展示了高效和稳定的太阳能电池，其中两种非富勒烯受体与可扩展和负担得起的供体聚合物聚（3-己基噻吩）（P3HT）和高效、低带隙聚合物在单层体异质结器件中组合。在没有任何溶剂添加剂的情况下，将强吸收性小分子受体添加到基于P3HT的非富勒烯共混物中将器件效率提高至7.7 +/-0.1%。这种改进归因于微观结构的变化，减少了电荷复合并增加了光电压，以及改善了可见光区域的光捕获。基于P3HT的器件在环境条件下的稳定性相对于聚合物：富勒烯器件也显著提高。结合低带隙供体聚合物（PBDTTT-EFT，也称为PCE 10），这两种混合受体也导致太阳能电池具有11.0 +/-0.4%的效率和1.03 +/-0.01V的高开路电压。
Technological deployment of organic photovoltaic modules requires improvements in device light-conversion effciency and stability while keeping material costs low. Here we demonstrate highly efficient and stable solar cells using a ternary approach, wherein two non-fullerene acceptors are combined with both a scalable and affordable donor polymer, poly(3-hexylthiophene) (P3HT), and a high- efficiency, low-bandgap polymer in a single-layer bulk-heterojunction device. The addition of a strongly absorbing small molecule acceptor into a P3HT-based non- fullerene blend increases the device efficiency up to 7.7 +/- 0.1% without any solvent additives. The improvement is assigned to changes in microstructure that reduce charge recombination and increase the photovoltage, and to improved light harvesting across the visible region. The stability of P3HT- based devices in ambient conditions is also significantly improved relative to polymer: fullerene devices. Combined with a low-bandgap donor polymer ( PBDTTT- EFT, also known as PCE10), the two mixed acceptors also lead to solar cells with 11.0 +/- 0.4% efficiency and a high open-circuit voltage of 1.03 +/- 0.01V.