Synthesis of Cu(In,Ga)(S,Se)₂ thin films using an aqueous spray-pyrolysis approach, and their solar cell efficiency of 10.5%

Abstract

An aqueous spray-pyrolysis approach for synthesizing Cu(In,Ga)(S,Se)2 thin film, which leads to 10.54% power conversion efficiency in solar cell, and shows ease of fabrication of films in large-scale at a much cheaper cost.

Cu(In,Ga)(S,Se)2 Thin Film Solar Cell with 10.7% Conversion Efficiency Obtained by Selenization of the Na-Doped Spray-Pyrolyzed Sulfide Precursor Film

“…To the best of our knowledge, this efficiency is one of the highest reported for chalcopyrite solar cells fabricated by using a nontoxic aqueous precursor route, and it is comparable to a recent report showing 10.5%-efficient device based on the spray-pyrolysis method. 39 The devices properties were relatively stable with no observed appreciable degradation upon prolonged exposure in air and/or under repetitive measurements.…”

Recent Progress in Solution‐Processed Copper‐Chalcogenide Thin‐Film Solar Cells

“…Therefore, the precise selection of solvent, additives, and precursors is very important to not only achieve complete dissolution of precursors and obtain a stable solution but also nucleation and growth of large crystals during precursor film formation. Widely used quaternary Cu‐chalcogenide precursors are metal oxides, metal salts, metal or metal chalcogenides, and metal organics . In addition, by using various amounts and types of chalcogens (S/Se) during the annealing process after the film formation, one is able to tune the band gap of the materials …”

“…In 2014, we successfully demonstrated the deposition of a device‐quality polycrystalline CuIn(S,Se) 2 thin film on Mo substrate without oxidation by employing a gradual heating and spraying process using environmentally benign halide‐based aqueous precursor solutions . Further improvement was achieved by incorporating different amounts of Ga into the CISSe thin film, and the as‐synthesized CIGSSe thin film shows favorable optoelectronic properties . After optimization of the In/Ga ratio, solar cells made of CIGSSe thin films exhibited a high fill factor (FF) of 69.84 %, high V oc of 0.621 V, and an efficiency of 10.54 % (Figure ).…”

“…The incident photon to current efficiency (IPCE) spectra (a) show blue‐shifted onsets with progressive Ga addition to the thin films. (b) J sc and V oc show an opposite trend to the Ga/(In+Ga) ratio, and (c) efficiency and E g variation with Ga/(In+Ga) ratio . J sc represents the short‐circuit current, V oc is the open‐circuit voltage, and E g is the bandgap.…”

Obtención de estructuras calcopirita (CIGS) y kesterita (CZTS) como absorbentes para dispositivos fotovoltaicos de capa fina mediante métodos de síntesis de bajo coste

“…Buenos resultados se han logrado con vías como spray pirolisis [70], la cual consiste en la deposición de un aerosol en forma de capa, sobre un sustrato caliente, donde se forma directamente el compuesto fotoabsorbente después de las etapas de secado y termólisis. En la Figura 16 se observa una representación esquemática del dicho proceso [71]. Figura 16.…”