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Efficient Perovskite Solar Cells with a Novel Aggregation‐Induced Emission Molecule as Hole‐Transport Material
Solar RRL ( IF 7.9 ) Pub Date : 2019-07-23 , DOI: 10.1002/solr.201900189
Yulin Cao 1, 2 , Wei Chen 2, 3 , Huiliang Sun 2 , Dong Wang 4 , Peng Chen 2 , Aleksandra B. Djurišić 3 , Yudong Zhu 2 , Bao Tu 2 , Xugang Guo 2 , Ben-Zhong Tang 4 , Zhubing He 2
Affiliation  

Organic hole‐transport materials (HTMs) are very promising for perovskite solar cells (PSCs) because the molecule structure is engineered via facile chemical routes. Herein, an aggregation‐induced emission (AIE) molecule, 2‐(2,7‐bis(4‐(bis(4‐methoxyphenyl)amino)phenyl)‐9H‐fluoren‐9‐ylidene)malononitrile (TFM), is successfully employed for the first time as a HTM in an inverted planar PSC, obtaining a promising device performance superior to that of the control device with poly(3,4‐ethylenedioxythiophene)‐poly(styrenesulfonate) (PEDOT:PSS) HTM. An optimal power conversion efficiency (PCE) of 16.03% is obtained for the TFM‐based PSCs with a Jsc of 22.68 mA cm−2, Voc of 0.97 V and FF of 72.9%, while that of the control PEDOT:PSS‐based device is 14.95%. Steady‐state and time‐resolved photoluminescence results reveal suppressed nonradiative recombination at the TFM/perovskite interface that is attributed to the effective passivation of the uncoordinated Pb at the perovskite surface by the CN groups of TFM molecules, as confirmed by X‐ray photoelectronic spectroscopy measurements. In addition to the passivation, the hydrophobic character of TFM films also contributes to the improved device stability. The findings demonstrate the potential of AIE molecules in PSCs and also paves a novel way to improve device performance and stability by molecular structure engineering of AIE molecules in the future.

中文翻译:

具有新型聚集诱导发射分子作为空穴传输材料的高效钙钛矿太阳能电池

钙钛矿型太阳能电池(PSC)的有机空穴传输材料(HTM)非常有前途,因为分子结构是通过简便的化学途径进行工程设计的。在此,聚集诱导发射(AIE)分子是2-(2,7-双(4-(双(4-甲氧基苯基)氨基)苯基)-9 H-芴-9-亚甲基)丙二腈(TFM)。首次成功在倒置平面PSC中作为HTM使用,获得了有希望的设备性能,优于具有聚(3,4-乙烯二氧噻吩)-聚(苯乙烯磺酸盐)(PEDOT:PSS)HTM的控制设备。对于J sc为22.68 mA cm -2V oc的基于TFM的PSC,可获得16.03%的最佳功率转换效率(PCE)0.97 V的电压为FF,而FF为72.9%,而基于PEDOT:PSS的控制器件的电压为14.95%。稳态和时间分辨光致发光结果揭示抑制非辐射复合在该归因于不协调铅的有效钝化在由CN钙钛矿表面的TFM /钙钛矿接口- TFM分子的基团,由X射线光电子证实光谱测量。除钝化外,TFM膜的疏水特性还有助于改善器件的稳定性。这些发现证明了AIE分子在PSC中的潜力,并为将来通过AIE分子的分子结构工程改善装置性能和稳定性开辟了一条新途径。
更新日期:2019-07-23
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