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

Abstract

Indium-free quaternary chalcogenide, Cu 2 ZnSnSe 4 (CZTSe), has driven much attention for its potential application in photovoltaics and optoelectronics. It is well known that the composition and structure of nanocrystals (NCs) significantly affect their optical and electrical properties. Controllable synthesis of materials with new crystal structures, especially metastable structures, has given impetus to the development of nanomaterials with many new exciting properties and applications. Highquality CZTSe NCs with thermodynamically metastable wurtzite phase and optical band gap of 1.46 eV were herein synthesized via a facile, lost-cost and safe-solution method. The formation mechanism of the wurtzite CZTSe NCs was investigated in detail, which indicates high reaction rate and low surface energy are favorable for the formation of wurtzite structure. The promising application of as-synthesized NCs in photovoltaics and optoelectronics has been demonstrated by the high-performance hybrid photodetector made from CZTSe NCs and P3HT, with an on/off ratio larger than 150.

Tailoring of the trap distribution and crystal field in Cr3+-doped non-gallate phosphors with near-infrared long-persistence phosphorescence

“…The results conclusively demonstrate the convenience and effectiveness of fabricating this type of LPP by intelligently tailoring the crystal field around the active center and by deploying the trap distributions. 42 Schematic energy level diagrams Figure 6 shows schematic energy level diagrams for the electron trapping-detrapping process in Cr 3+ -doped Zn 2-x Al 2x Sn 1-x O 4 phosphors. (i) The Cr 3+ ion can substitute for Zn 2+ or Sn 4+ in the distorted octahedral coordination because of their identical ionic radii and the tendency for defect formation that arises in the characteristic inverse spinel crystal structure in the form of non-equivalent substitution.…”

Cu2ZnSnS4, Cu2ZnSnSe4, and Related Materials

“…Adapted from Ref. [59] control, for example, they can be stabilized in nanocrystal samples [64][65][66][67]. Based on the X-ray diffraction pattern, these samples have wurtzite-derived structural framework, but the exact occupation of Cu, Zn, and Sn on the cation sublattice cannot be exactly determined so far, and therefore, it is not clear which wurtzite-derived structure (wurtzite-kesterite, wurtzite-stannite, or other low-energy structures) is dominant in the samples.…”

Silicium‐Nanokristalle und Silicium‐Polymer‐Hybridmaterialien: Synthese, Oberflächenmodifikation und Anwendungen

“…B. CuInSe 2 ,C uInS 2 ) [64] und quaternäre (Cu 2 ZnSnSe 4 ) [65] Quantenpunkten wurden bereits einige Hybridmaterialien beschrieben. Demgegenüber befindet sich die Entwicklung von SiNK-Polymer-Hybriden noch am Anfang,w as teilweise aus der geringen Verfügbarkeit von definierten SiNKs resultierte.…”