Insights into the Properties of Deep Eutectic Solvent Based on Reline for Ga-Controllable CIGS Solar Cell in One-Step Electrodeposition

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Abstract
A deep eutectic solvent (DES) called Reline has attracted great interests in photovoltaic application. Many efforts have been made to get high efficiency solar cells by electrodeposition in such a low-cost and green electrolyte. In this work, the micro-structure and electrochemical properties of Reline are investigated. The metal complex system of Reline and metal salts is deduced by FTIR and UV-Vis absorption spectroscopy analyses. The theoretical diffusion coefficients of Cu, In and Ga at 65°C are calculated by Cyclic voltammetry analysis to perform a controllable Ga/(In+Ga) ratio over a large range (0 ∼ 0.53) by different pulse potentiostatic methods. Based on these achievements and optimizations, the best CIGS solar cell device with a promising efficiency of 10.1% is achieved.

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