Efficient charge transport in surface engineered TiO2 nanoparticulate photoanodes leading to improved performance in quantum dot sensitized solar cells
Efficient charge transport in surface engineered TiO2 nanoparticulate photoanodes leading to improved performance in quantum dot sensitized solar cells
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DOI：
10.1016/j.solener.2019.02.001
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发表时间：
2019-03
期刊：
影响因子：
6.7
通讯作者：
S. Maiti;Farazuddin Azlan;Y. Jadhav;Jayanta Dana;P. Anand;S. Haram;G. Dey;H. Ghosh
中科院分区：
文献类型：
--
作者：
S. Maiti;Farazuddin Azlan;Y. Jadhav;Jayanta Dana;P. Anand;S. Haram;G. Dey;H. Ghosh
利用冷氩等离子体处理的TiO 2纳米光阳极制备了量子点敏化太阳能电池（QDSSC）。等离子体处理后的TiO 2纳米粒子得到组装在一个紧密的间隔的方式与增加的表面粗糙度因子由于表面蚀刻的高能离子，电子和自由基存在于等离子体输出。光阳极具有高颗粒间接触，提供快速的电荷载流子传输网络，最大限度地减少电荷载流子的损失。电导率的增加通过导电AFM测量来探测。这种形态的变化显着抑制了3.5倍，在TiO 2/NC/电解质界面的界面复合，通过电化学阻抗谱证实。此外，如通过X射线光电子能谱所建议的，Ti 3+的增加也有助于提供额外的电子供体状态的导电性的增强。使用这些等离子体处理的TiO 2光阳极的CdSe0.4S0.6合金纳米晶（NC）敏化太阳能电池的功率转换效率从3.65%提高到5.01%。因此，我们的策略铺平了有前途的方向，提高效率的QDSSC器件。
Cold argon plasma treated TiO2nanoparticulate photoanodes have been utilized for fabrication of quantum dot sensitized solar cells (QDSSCs). After plasma treatment the TiO2nanoparticles got assembled in a closely spaced manner with increase in surface roughness factor owing to surface etching by the highly energetic ions, electron and radicals present in the plasma output. The photoanodes possess high inter-particle contact delivering fast charge carrier transport network minimizing the loss of charge carriers. The increase in conductivity was probed through conducting-AFM measurements. This morphological variation significantly inhibits the interfacial recombination by 3.5 times at the TiO2/NC/electrolyte interface as confirmed through electrochemical impedance spectroscopy. Moreover, the increase in Ti3+as suggested by X-ray photoelectron spectroscopy also contributes in the enhancement of conductivity providing additional electron donor states. The power conversion efficiency increased from 3.65% to 5.01% for CdSe0.4S0.6alloy nanocrystals (NCs) sensitized solar cells utilizing these plasma treated TiO2photoanodes. Thus our strategy paves promising direction for the efficiency enhancements in QDSSC devices.