CZTS和CZTSSe纳米晶热注入法合成与性能研究

Synthesis and Characterization of CZTS and CZTSSe Nanocrystals by Hot-injection Method

采用热注入法制备Cu_2ZnSnS4(CZTS)和Cu_2ZnSn(S,Se)4(CZTSSe)纳米晶,研究了不同反应温度对所制备的CZTS和CZTSSe纳米晶的晶体结构、化学组分、形貌及光学性能的影响。实验结果表明:未掺杂Se元素的CZTS纳米晶,当反应温度为230℃时为锌黄锡矿结构,当反应温度在240~280℃范围变化时,锌黄锡矿和纤锌矿结构共存,纳米晶形貌由纳米颗粒和纳米棒组成,其禁带宽度在1.54~1.62eV之间变化。对于掺杂Se元素的CZTS纳米晶,当反应温度在230~260℃范围变化时,为锌黄锡矿结构,而当反应温度为270~280℃时,CZTSSe纳米晶由锌黄锡矿结构和少量纤锌矿结构组成,纳米晶形貌由纳米颗粒组成,其禁带宽度比CZTS的禁带宽度低,禁带宽度在1.41~1.46eV之间变化。

Cu2ZnSnS4（CZTS） and Cu2ZnSn（S,Se）4 （CZTSSe） nanocrystals （NCs） were synthesized by hot injection method, the influence of different reaction temperatures on the crystal structure, chemical composition, morphology and optical properties of CZTS and CZTSSe was investigated. The results showed that the CZTS NCs were kesterite structure when the reaction temperature was 230℃ ,but when the reaction temperature changed from 240 ℃ to 280 ℃, the phase composition of the products was consisted of kesterite and wurtzite. And the morphology of NCs was consisted of nanoparticles and nanorods. The band gap of the NCs prepared at different reaction temperatures varied between 1.54 eV and 1.62 eV. For Se-doped CZTS NCs, when the reaction temperature was in the range of 230 ℃ to 260 ℃, the CZTSSe NCs were kesterite structure. When the reaction temperature was 270 ℃ to 280 ℃, the crystal phase was composed of kesterite structure and a small amount of wurtzite structure. The morphology of CZTSSe consists of nanoparticles. The band gap was lower than that of CZTS, which varied between 1.41 eV and 1.46 eV.