Tuyển tập các báo cáo nghiên cứu về hóa học được đăng trên tạp chí hóa hoc quốc tế đề tài : Synthesis of hexagonal structured wurtzite and chalcopyrite CuInS2 via a simple solution route | Sheng et al. Nanoscale Research Letters 2011 6 562 http content 6 1 562 o Nanoscale Research Letters a SpringerOpen Journal NANO EXPRESS Open Access Synthesis of hexagonal structured wurtzite and chalcopyrite CuInS2 via a simple solution route Xia Sheng Lei Wang Yeping Luo and Deren Yang Abstract Wurtzite semiconductor CuInS2 CIS has been reported in recent years. As a kind of metastable structure it is a great challenge to synthesize pure wurtzite CIS at low temperature. In this paper via a simple and quick solution route we synthesize both wurtzite- and chalcopyrite-structure CIS. Well-controlled wurtzite CIS hexagonal plates are obtained when an appropriate agent is added. The influence of the used agent triethanolamine TEA has also been studied and it turns out that without TEA chalcopyrite CIS with a kind of rare morphology is formed through this method. Keywords wurtzite chalcopyrite hexagonal structure CuInS2 Introduction Ternary I-III-VI2 semiconductors have garnered great interest due to their promising photovoltaic applications 1 2 . Meanwhile the growing need for highly efficient and low-cost photovoltaic devices continues to drive new research in developing non-vacuum techniques. Thus solution routes to fabricate I-III-VI2 semiconductor nanocrystals have been greatly developed because nanocrystal synthesis can utilize lower-cost processing and device fabrication can benefit from roll-to-roll or solution-phase processing such as spin-coating 3-10 . Among the kinds of I-III-VI2 semiconductors one good example is CuInS2 CIS which has high optical absorption coefficient 105 cm-1 and desirable bandgap approximately eV that matches well with solar spectra 11 12 . Therefore researches on nanocrystal CIS synthesis have attached great attention 13-18 . It was reported that CIS has three crystal structures 19 20 these are 1 the chalcopyrite structure CH-CIS stable from room temperature to 1 253 K 2 the zinc-blende structure stable .
