Improvement of Photovoltaic Performance of Colloidal Quantum Dot Solar Cells Using Organic Small Molecule as Hole-Selective Layer.
Improvement of Photovoltaic Performance of Colloidal Quantum Dot Solar Cells Using Organic Small Molecule as Hole-Selective Layer.
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DOI：
10.1021/acs.jpclett.7b00683
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发表时间：
2017-05
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影响因子：
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通讯作者：
Yaohong Zhang;Guohua Wu;I. Mora‐Seró;Chao Ding;Feng Liu;Qingxun Huang;Y. Ogomi;S. Hayase;T. To
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文献类型：
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作者：
Yaohong Zhang;Guohua Wu;I. Mora‐Seró;Chao Ding;Feng Liu;Qingxun Huang;Y. Ogomi;S. Hayase;T. To
成功地合成了一种新型的有机小分子双三苯胺，以螺（芴-9,9′-杂蒽）为共轭体系，命名为BTPA-4，并将其用作胶体量子点太阳能电池（cqdsc）的孔选择层（HSL）。BTPA-4层的引入可以显著延长有效载流子寿命τeff，增加电荷复合电阻Rrec，从而减少PbS-QDs/Au电极界面的电荷复合。BTPA-4作为HSL对器件性能的影响尤其显著，开路电压（Voc）和功率转换效率（PCE）分别比未添加HSL的器件提高了约10%和15%。此外，含有BTPA-4的PbS cqdsc在环境气氛下具有100天以上的稳定性。
A novel organic small molecule bis-triphenylamine with spiro(fluorene-9,9'-xanthene) as the conjugated system, named BTPA-4, is successfully synthesized and employed as the hole-selective layer (HSL) in colloidal quantum dots solar cells (CQDSCs). The introduction of BTPA-4 layer can significantly prolong effective carrier lifetime (τeff), increase charge recombination resistance (Rrec), and thus diminish the interfacial charge recombination at the PbS-QDs/Au electrode interface. The effect of BTPA-4 as HSL in the device performance is especially significant for the open-circuit voltage (Voc) and power conversion efficiency (PCE), with a ∼ 10% and 15% enhancement respectively, comparing with those of device without the HSL. Furthermore, the PbS CQDSCs with BTPA-4 possessed a noticeably stable property for over 100 days of storage under ambient atmosphere.