The optical and electrical properties regulation of TiO 2 mesoporous thin film in perovskite solar cells
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The optical and electrical properties regulation of TiO2 mesoporous thin film in perovskite solar cells Qian Li1
, Jiqiu Qi1,2,3, Jian Song1,2,3, Lei Zhu1,2,3,*, and Yulong Zhao1,2,3,*
1
School of Materials and Physics, China University of Mining and Technology, Xuzhou 221116, People’s Republic of China Jiangsu Province Engineering Laboratory of High Efficient Energy Storage Technology and Equipments, China University of Mining and Technology, Xuzhou 221116, People’s Republic of China 3 Xuzhou City Key Laboratory of High Efficient Energy Storage Technology and Equipments, China University of Mining and Technology, Xuzhou 221116, People’s Republic of China 2
Received: 15 April 2020
ABSTRACT
Accepted: 27 October 2020
In this work, we investigate how TiO2 nanotube and nanosheet composite mesoporous TiO2 layers can improve the power conversion efficiency (PCE) of perovskite solar cells (PSCs) with respect to pure mesoporous TiO2. Pure and nanotube/nanosheet composite TiO2, nanostructure of three different concentrations (0.5, 1, and 3 mol%) were synthesized by a simple, hydrothermal method and characterized by XRD, SEM, transmission electron microscopy (TEM), and UV–Vis diffuse reflection spectroscopy. TiO2 nanotubes and TiO2 nanosheets were incorporated into the TiO2 porous layer of perovskite solar cell, which outperform cells using pure TiO2 in several ways: higher open-circuit voltage (Voc) (1.06 V), power conversion efficiency (PCE) (15.58%), short-circuit current (Jsc), and fill factor (FF). These properties improvements are attributed to the better properties of modulated TiO2 as compared to TiO2 such as better optical transmission properties, faster electron transfer rate and higher electron lifetime. This work provides a simple and effective strategy to improve TiO2 porous layer, which is significant for the study of the cell porous layer in perovskite solar.
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Springer Science+Business
Media, LLC, part of Springer Nature 2020
1 Introduction In the last two decades, humans have been attracted to organic-inorganic hybrid d lead-halide compounds perovskite solar cells (PSCs) due to their adjustable energy gap value, extremely high absorption coefficient ([ 104 cm-1), and long charge carrier
diffusion length (100–1000 nm)[1]. In addition, with the deepening of the understanding of this solar cell and the continuous optimization of the preparation process, its photoelectric conversion efficiency has also increased from the initial 4% to more than 20% [2–4], showing a beneficial application prospect. At the same time, the organic–inorganic hybrid perovskite material has a low-temperature
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https://doi.org/10.1007/s10854-020-04770-0
J Mater Sci: Mater Electron
crystallization characteristic, which greatly simplifies the processing of the battery compared to conventional silicon solar cells. The classic perovskite solar cell consists of an electron transport layer, a perovskite photosensitizer, a hole transport layer and a metal cou
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