Synthesis of Shape-Controlled Monodisperse Wurtzite CuIn_xGa_1–xS₂ Semiconductor Nanocrystals with Tunable Band Gap

Abstract

Monodisperse wurtzite CuIn(x)Ga(1-x)S(2) nanocrystals have been synthesized over the entire composition range using a facile solution-based method. Depending on the chemical composition and synthesis conditions, the morphology of the nanocrystals can be controlled in the form of bullet-like, rod-like, and tadpole-like shapes. The band gap of the nanocrystals increases linearly with increasing Ga concentration, with band gap values for the end members being close to those observed in the bulk. Colloidal suspensions of the nanocrystals are attractive for use as inks for low-cost fabrication of thin film solar cells by spin or spray coating.

Wurtzite Cu2ZnSnSe4 nanocrystals for high-performance organic–inorganic hybrid photodetectors

“…[19][20][21][22]25 Recently, Li and coworkers 26 reported the Cu 2 ZnSnS 4 NCs with wurtzite structure, which has been found in many binary and ternary chalcogenides, but seldom in quaternary compounds. 8,13,14,29,30 The wurtzite structure owns disordered cations, and the random distribution of A and B ions in the wurtzite phase offers the flexibility for stoichiometry control, which is advantageous for the fabrication of photovoltaic devices, as it provides the ability to tune energy band gap for device optimization. 30 Therefore, controllable synthesis of materials with new crystal structures, especially metastable structures such as wurtzite, is opening up an avenue to develop nanomaterials with new exciting properties and applications.…”

“…8,13,14,29,30 The wurtzite structure owns disordered cations, and the random distribution of A and B ions in the wurtzite phase offers the flexibility for stoichiometry control, which is advantageous for the fabrication of photovoltaic devices, as it provides the ability to tune energy band gap for device optimization. 30 Therefore, controllable synthesis of materials with new crystal structures, especially metastable structures such as wurtzite, is opening up an avenue to develop nanomaterials with new exciting properties and applications. 8,11,14,27,30 This encourages us to investigate the formation of ternary and multiple component chalcogenides with wurtzite structure.…”

“…30 Therefore, controllable synthesis of materials with new crystal structures, especially metastable structures such as wurtzite, is opening up an avenue to develop nanomaterials with new exciting properties and applications. 8,11,14,27,30 This encourages us to investigate the formation of ternary and multiple component chalcogenides with wurtzite structure. In this paper, we, for the first time, reported the synthesis of CZTSe quaternary NCs with wurtzite structure, their formation mechanism and the use in high-performance hybrid photodetector.…”

The phase transformation of CuInS2 from chalcopyrite to wurtzite

“…Compared with chalcopyrite CuInS 2 , the wurtzite CuInS 2 showed a higher and broader absorption in the entire visible region and near-infrared region. The bandgap can be determined by plotting (αhν) 2 versus hν (α = absorbance, h = Planck's constant, and ν = frequency) [26,27]. As shown in the inset picture, the calculated optical bandgap for chalcopyrite and wurtzite CuInS 2 is about 1.54 and 1.47 eV, respectively, which is close to the bulk energy bandgap of CuInS 2 .…”

Phase-controlled synthesis of Cu2ZnSnS4 powders via the microwave-assisted solvothermal route

“…stoichiometry owing to the cations sharing a lattice site, leading to the tunability of the Fermi energy over a wide range [10,11]. Wurtzite Cu 2 ZnSnS 4 is considered to have the potential for modifying the performance of Cu 2 ZnSnS 4 thin-film solar cells.…”