Crystal phase-controlled synthesis of Cu2FeSnS4 nanocrystals with a band gap of around 1.5 eV

Abstract

Cu(2)FeSnS(4) (CFTS) nanocrystals with tunable crystal phase have been synthesized using a solution-based method. As-synthesized CFTS nanocrystals in the shape of oblate spheroid and triangular plate with band gaps of 1.54 ± 0.04 and 1.46 ± 0.03 eV, respectively, appear attractive as a low-cost substitute for thin film solar cells.

Structural, optical and electrical properties of Cu2FeSnX4 (X=S, Se) thin films prepared by chemical spray pyrolysis

“…For the sake of alternative absorber layer, a member of Cu-based quaternary chalcogenide family Cu 2 FeSnS 4 (Se 4 ) (CFTS (Se)) [6] has been considered as a promising candidate due to earth abundant constituents and similar structural and optical properties to CZTSSe [2,4,7,8]. Recently, a number of researches have been carried out on CFTS (Se) materials and reported to have optical band gaps, 1.28-1.50 eV for CFTS [7][8][9][10][11][12][13][14][15][16] and 1.10-1.25 eV for CFTSe [17][18][19] suitable for absorber layer in photovoltaic application. The crystal structure of CFTS (Se) (stannite (ST), space group (I 2m)) is shown in Fig.…”

“…1. Several approaches have been employed to synthesize CFTS quaternary semiconductors having various morphological features including thin films [7][8][9] and nanoscale structures such as nanocrystals [10][11][12][13], nanoparticles [14], nanospheres [15] and nanowire array [16]. Recently, dye-sensitized solar cells (DSSC) fabricated with CFTS thin films as a photocathode have been reported with promising PCE which indicates its potential for solar energy harvesting [20].…”

Biomolecule-assisted solvothermal synthesis of 3D hierarchical Cu2FeSnS4 microspheres with enhanced photocatalytic activity

“…Based on this purpose, various types of semiconducting materials, such as CdTe/CdSe, Cu(In x Ga 1−x )Se 2 (CIGS), etc., have been extensively studied [2,3]. However, due to the limited availability of indium and gallium and the toxicity of cadmium, it is considerable interesting to develop inexpensive, non-toxic, earth-abundant photocatalytic materials [4,5]. Over the past years, scientists have been trying their best to find some materials consisted of only earth-abundant elements and retain the similar structure to CIGSS.…”

“…Moreover, its suitable optical band gap (1.2-1.5 eV) and nontoxic constituents have attracted increasing attention [5]. Various methods have been used to prepare CFTS including solution-based method [5,9], microwave nonaqueous synthesis method [10], spray pyrolysis [11], thermal decomposition [12], ultrasound-assisted microwave irradiation [13], solvothermal/hydrothermal method [14][15][16], etc. As an important solution-based chemical process, the solvothermal method has been extensively used to prepare various materials for its low temperature, simplicity and high yield.…”

Электрические и оптические свойства пленок Cu-=SUB=-2-=/SUB=-Zn(Fe,Mn)SnS-=SUB=-4-=/SUB=-, изготовленных спрей-пиролизом

“…Наряду с тонкими пленками CZTS, для изготовления фотопреобразователей привлекают внимание соедине-ния Cu 2 FeSnS 4 (CFTS), также обладающие высоким коэффициентом поглощения света и шириной запрещен-ной зоны E g ∼ 1.2 · 1.71 eV [6][7][8][9][10], значение которой зависит от способов изготовления и получаемых кри-сталлических структур пленок. Относительно недавно начатые исследования солнечных элементов на основе CFTS являются причиной того, что их эффективность ∼ 8% [11] пока уступает фотопреобразователям на ос-нове CZTS.…”