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Dopant‐Free, Donor–Acceptor‐Type Polymeric Hole‐Transporting Materials for the Perovskite Solar Cells with Power Conversion Efficiencies over 20%
Advanced Energy Materials ( IF 24.4 ) Pub Date : 2019-12-16 , DOI: 10.1002/aenm.201903146 Guofeng You 1 , Qixin Zhuang 1 , Lijun Wang 1 , Xinyu Lin 1 , Ding Zou 1 , Zhenghuan Lin 1 , Hongyu Zhen 1, 2 , Wenliu Zhuang 3 , Qidan Ling 1
Advanced Energy Materials ( IF 24.4 ) Pub Date : 2019-12-16 , DOI: 10.1002/aenm.201903146 Guofeng You 1 , Qixin Zhuang 1 , Lijun Wang 1 , Xinyu Lin 1 , Ding Zou 1 , Zhenghuan Lin 1 , Hongyu Zhen 1, 2 , Wenliu Zhuang 3 , Qidan Ling 1
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The rich molecular design of electron donor (D)–acceptor (A) polymers offers many valuable clues to obtain high‐efficiency hole‐transporting materials (HTMs) for use in perovskite solar cells (PVSCs). The fused aromatic or heteroaromatic units can increase the conjugation of the polymer backbone to facilitate electron delocalization, which increases the rigidity of adjacent units to prevent rotational disorder and lower the reorganization energy, leading to improved carrier mobility and optimized film morphology. In this work, fused‐ring ladder‐type indacenodithiophene and indacenodithieno[3,2‐b]thiophene are used as D units, benzodithiophene‐4,8‐dione as the A unit, and thienothiophene as a π‐bridge to form the D–A polymers PBDTT and PBTTT, respectively. Both polymers exhibit favorable properties as HTMs including suitable energy levels, high hole mobility, and excellent film quality. Both dopant‐free HTMs endow n‐i‐p PVSCs with promising performance and stability. A maximum power conversion efficiency of 20.28% is achieved for PBDTT‐based devices, which is among the highest values reported to date.
中文翻译：
钙钛矿型太阳能电池的无掺杂，施主-受体型聚合物空穴传输材料，功率转换效率超过20％
电子供体（D）-受体（A）聚合物的丰富分子设计为获得用于钙钛矿太阳能电池（PVSC）的高效空穴传输材料（HTM）提供了许多有价值的线索。稠合的芳族或杂芳族单元可以增加聚合物主链的共轭以促进电子离域，从而增加相邻单元的刚性以防止旋转紊乱并降低重组能量，从而导致改善的载流子迁移率和优化的膜形态。在这项工作中，稠环阶梯型茚满二噻吩和茚满二噻吩并[3,2-b]噻吩被用作D单元，苯并二噻吩-4,8-二酮被用作A单元，噻吩并噻吩作为π桥形成D。 –分别为聚合物PBDTT和PBTTT。两种聚合物均表现出良好的性能，因为HTM的能量水平合适，高空穴迁移率和出色的薄膜质量。两种无掺杂的HTM都赋予n-i-p PVSC良好的性能和稳定性。基于PBDTT的设备的最大功率转换效率达到20.28％，是迄今为止报告的最高值之一。
更新日期：2020-02-04
中文翻译：
钙钛矿型太阳能电池的无掺杂，施主-受体型聚合物空穴传输材料，功率转换效率超过20％
电子供体（D）-受体（A）聚合物的丰富分子设计为获得用于钙钛矿太阳能电池（PVSC）的高效空穴传输材料（HTM）提供了许多有价值的线索。稠合的芳族或杂芳族单元可以增加聚合物主链的共轭以促进电子离域，从而增加相邻单元的刚性以防止旋转紊乱并降低重组能量，从而导致改善的载流子迁移率和优化的膜形态。在这项工作中，稠环阶梯型茚满二噻吩和茚满二噻吩并[3,2-b]噻吩被用作D单元，苯并二噻吩-4,8-二酮被用作A单元，噻吩并噻吩作为π桥形成D。 –分别为聚合物PBDTT和PBTTT。两种聚合物均表现出良好的性能，因为HTM的能量水平合适，高空穴迁移率和出色的薄膜质量。两种无掺杂的HTM都赋予n-i-p PVSC良好的性能和稳定性。基于PBDTT的设备的最大功率转换效率达到20.28％，是迄今为止报告的最高值之一。
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