Abstract
In this work, a multi-electron transporting layer (ETL) for efficient perovskite solar cells is investigated. The multi-ETL consists of five conditions including SnO2, SnO2/SnOx, TiO2, TiO2/SnO2, and TiO2/SnO2/SnOx. The best performance of PSC devices is found in the SnO2/SnOx double-layer and exhibits a power conversion efficiency equal to 18.39% higher than the device with a TiO2 single-layer of 14.57%. This enhancement in efficiency can be attributed to a decrease in charge transport resistance (Rct) and an increase in charge recombination resistance (Rrec). In addition, Rct and Rrec can be used to explain the comparable power conversion efficiency (PCE) between a PSC with a SnO2/SnOx double-layer and a PSC with a triple-layer, which is due to the compensation effect of Rct and Rrec parameters. Therefore, Rct and Rrec are good parameters to explain the efficiency enhancement in PSC. Thus, the Rct and Rrec from the electrochemical impedance spectroscopy (EIS) technique is an easy and alternative way to obtain information to understand and characterize the multi-ETL on PSC.
Highlights
The perovskite solar cell (PSC), as a new type of solar cell, has become an excellent photoelectric converter due to its low-cost and high-efficiency ability to harvest solar energy [1,2,3,4,5,6,7]
It can be seen that Rct, which can be derived from the light condition, and recombination resistance (Rrec), which can be derived from the dark condition, are suitable parameters to explain the efficiency enhancement in PSCs
It is found that the PSC devices fabricated with a SnO2 /SnOx double-layer in electron transporting layer (ETL) exhibit the highest power conversion efficiency (PCE) of 18.39%
Summary
Kritsada Hongsith 1,2,3 , Vasan Yarangsi 1,2,3 , Sukrit Sucharitakul 1,2,3 , Surachet Phadungdhitidhada 1,2,3 , Athipong Ngamjarurojana 1,2,3 and Supab Choopun 1,2,3, *. A Multi-Electron Transporting Layer for Efficient Perovskite Solar Cells. Research Center in Physics and Astronomy, Faculty of Science, Chiang Mai University, Chiang Mai 50200, Thailand. Thailand Center of Excellence in Physics, Ministry of Higher Education, Science, Research and Innovation, 328 Si Ayutthaya Road, Bangkok 10400, Thailand
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