Enhanced interfacial contact between PbS and TiO2 layers in quantum dot solar cells using 2D-arrayed TiO2 hemisphere nanostructures

被引：10
作者：
Lee, Wonseok [1 ]
Ryu, Ilhwan [1 ]
Lee, Haein [1 ]
Yim, Sanggyu [1 ]
机构：
[1] Kookmin Univ, Dept Chem, Seoul 02707, South Korea
来源：
APPLIED SURFACE SCIENCE | 2018年 / 432卷
基金：
新加坡国家研究基金会;
关键词：
Titanium dioxide; Hemispherical nanostructures; Lead sulfide; Quantum dot solar cells; PHOTOVOLTAICS; LIGHT; ZNO;
D O I：
10.1016/j.apsusc.2017.07.235
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
Two-dimensionally (2D) arrayed hemispherical nanostructures of TiO2 thin films were successfully fabricated using a simple procedure of spin-coating or dip-coating TiO2 nanoparticles onto 2D close-packed polystyrene (PS) nanospheres, followed by PS extraction. The nanostructured TiO2 film was then used as an n-type layer in a lead sulfide (PbS) colloidal quantum dot solar cell. The TiO2 nanostructure could provide significantly increased contacts with subsequently deposited PbS quantum dot layer. In addition, the periodically arrayed nanostructure could enhance optical absorption of the cell by redirecting the path of the incident light and increasing the path length passing though the active layer. As a result, the power conversion efficiency (PCE) reached 5.13%, which is approximately a 1.7-fold increase over that of the control cell without nanostructuring, 3.02%. This PCE enhancement can mainly be attributed to the increase of the short-circuit current density from 19.6 mA/cm(2) to 30.6 mA/cm(2), whereas the open-circuit voltage and fill factor values did not vary significantly. (C) 2017 Elsevier B.V. All rights reserved.
引用
收藏
页码：255 / 261
页数：7
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