15% Efficiency Tandem Organic Solar Cell Based on a Novel Highly Efficient Wide-Bandgap Nonfullerene Acceptor with Low Energy Loss
15% Efficiency Tandem Organic Solar Cell Based on a Novel Highly Efficient Wide-Bandgap Nonfullerene Acceptor with Low Energy Loss
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15%%20Efficiency%20Tandem%20Organic%20Solar%20Cell%20Based%20on%20a%20Novel%20Highly%20Efficient%20Wide-Bandgap%20Nonfullerene%20Acceptor%20with%20Low%20Energy%20Loss
DOI：
10.1002/aenm.201803657
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发表时间：
2019-03-01
影响因子：
27.8
通讯作者：
Cao, Yong
中科院分区：
文献类型：
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作者：
Liu, Gongchu;Jia, Jianchao;Cao, Yong
串联有机太阳能电池（OSC）是扩大光子响应范围并抑制传输损耗和热化损耗的有效结构。在过去的几年中，用于背面子电池的在长波长区域具有宽吸收的低带隙材料的开发引起了人们的广泛关注。然而，同时具有高短路电流密度（J（SC））和开路电压（V-OC）的用于前电池的宽带隙材料很少。本工作报道了一种新型氟取代宽带隙小分子非富勒烯受体TfIF-4FIC，其光学带隙为1.61 eV。当选择PBDB-T-2F作为供体时，该器件提供0.98 V的极高V-OC、17.6 mA cm(-2)的高J(SC)和13.1%的功率转换效率。这是具有如此宽禁带的性能最好的受体。更重要的是，该组合的能量损失为 0.63 eV。这些特性确保 PBDB-T-2F:TfIF-4FIC 成为制造串联 OSC 的理想选择。当PBDB-T-2F:TfIF-4FIC和PTB7-Th:PCDTBT:IEICO-4F分别作为前电池和后电池构建叠层太阳能电池时，获得了15%的PCE，这是迄今为止有机太阳能电池领域报道的最好结果之一。
A tandem organic solar cell (OSC) is a valid structure to widen the photon response range and suppress the transmission loss and thermalization loss. In the past few years, the development of low-bandgap materials with broad absorption in long-wavelength region for back subcells has attracted considerable attention. However, wide-bandgap materials for front cells that have both high short-circuit current density (J(SC)) and open-circuit voltage (V-OC) are scarce. In this work, a new fluorine-substituted wide-bandgap small molecule nonfullerene acceptor TfIF-4FIC is reported, which has an optical bandgap of 1.61 eV. When PBDB-T-2F is selected as the donor, the device offers an extremely high V-OC of 0.98 V, a high J(SC) of 17.6 mA cm(-2), and a power conversion efficiency of 13.1%. This is the best performing acceptor with such a wide bandgap. More importantly, the energy loss in this combination is 0.63 eV. These properties ensure that PBDB-T-2F:TfIF-4FIC is an ideal candidate for the fabrication of tandem OSCs. When PBDB-T-2F:TfIF-4FIC and PTB7-Th:PCDTBT:IEICO-4F are used as the front cell and the back cell to construct tandem solar cells, a PCE of 15% is obtained, which is one of best results reported to date in the field of organic solar cells.