High performance of TiO2 based solar cells sensitized with copper-indium sulfide colloids prepared in water: Roles of surface modifications with indium sulfide and zinc sulfide by SILAR methods
High performance of TiO2 based solar cells sensitized with copper-indium sulfide colloids prepared in water: Roles of surface modifications with indium sulfide and zinc sulfide by SILAR methods
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DOI：
10.1016/j.electacta.2016.11.051
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发表时间：
2016-12
影响因子：
6.6
通讯作者：
S. Higashimoto;T. Okada;Taisuke Arase;M. Azuma;Mari Yamamoto;Masanari Takahashi
中科院分区：
文献类型：
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作者：
S. Higashimoto;T. Okada;Taisuke Arase;M. Azuma;Mari Yamamoto;Masanari Takahashi
在水中直接制备了巯基乙酸包覆的铜-铟-硫化物（CIS）三元胶体，并将其不经配体交换而牢固地吸附在TiO 2上形成CIS-TiO 2光电极。此外，光电极通过连续离子层吸附和反应（SILAR）与硫化铟和/或硫化锌相修饰。在室温下制备的CIS胶体太阳能电池中，CIS-TiO 2光电极的光电转换效率最高，为4.39%.高太阳能电池性能的起源归因于后表面改性：通过In 3 +/S2−离子的SILAR处理改善CIS的光吸收和费米能级的阴极位移，这是由于空位的减少，而通过Zn 2 +/S2−离子的SILAR处理形成钝化层，用于阻止电极和电解质之间的界面处的背电子转移，以阻止电荷复合。通过表面修饰的协同效应，提高了太阳能电池的PCE。
The copper-indium-sulfide (CIS) ternary colloids capped with thioglycolic acid were directly prepared in water, and these hydrophilic colloids were strongly adsorbed on the TiO2to form CIS-TiO2photoelectrodes without ligand-exchange. Furthermore, the photoelectrodes were modified with indium sulfide and/or zinc sulfide phases via successive ionic layer adsorption and reaction (SILAR). The preferable CIS-TiO2photoelectrode exhibited the photo-conversion efficiency (PCE) yielding with 4.39%, which is the highest value among the solar cell employing CIS colloids prepared in water at room temperature. The origin of high solar cell performance is attributed to the post surface modifications: the SILAR treatment by In3+/S2−ions improves light absorption of CIS and cathodic shift of the Fermi level due to the reduction of vacancies, while that by Zn2+/S2−ions forms passivation layers for blocking the back electron transfer at the interface between the electrode and electrolyte for retarding charge-recombination. The synergetic effects by surface modifications of the CIS-TiO2thus improved the PCE of the solar cell.