作　　者： ; ; ; ; ; ; ;

机构地区： 厦门大学

出　　处： 《物理化学学报》 2015年第7期1331-1337,共7页

摘　　要： 分别以Cu I和In Ac3作为铜源和铟源,十二硫醇(DDT)作为硫源,采用直接加热法合成不同尺寸的Cu In S2(CIS)量子点.运用X射线衍射(XRD),拉曼光谱(Raman),高分辨率透射电镜(HRTEM),紫外-可见(UVVis)吸收光谱表征其相结构、形貌及光学性能.结果表明:制备的CIS量子点为黄铜矿结构,且随着时间的延长,量子点逐渐长大,吸收光谱的激子吸收峰逐渐红移,表现出量子尺寸效应.采用巯基乙酸为双功能耦联剂辅助吸附法制备CIS敏化的Ti O2薄膜.通过衰减全反射红外光谱(ATR-FTIR)分析得出,巯基乙酸上的羧基与Ti O2表面羟基连接,另一端上的巯基代替长链的DDT与CIS耦联,将CIS成功锚定在Ti O2表面.该方法不仅操作简单,而且容易实现CIS在Ti O2表面的吸附.太阳电池光电性能测试表明,粒径大小约为3.6 nm的CIS量子点表现出最优的吸附能力以及光电转换性能.进一步采用连续离子吸附层法对CIS敏化的Ti O2薄膜进行Cd S包覆,光电转换性能大大提高,其效率达到2.83%,这主要源于Cd S的包覆钝化了CIS的表面缺陷,有效地降低了电子复合. Col oidal chalcopyrite CuInS2 （CIS） quantum dots （QDs） were synthesized using copper（I） iodine （CuI） and indium（III） acetate （InAc3） as metal cationic precursors, and dodecanethiol （DDT） as the sulfur source and solvent. The microstructure and optical properties of the prepared CIS QDs were characterized by X-ray diffraction （XRD）, Raman spectroscopy, high-resolution transmission electron microscopy （HRTEM）, and UV-Vis absorption spectroscopy. The results showed that the CIS consisted of chalcopyrite phase and exhibited Cu-Au ordering. With prolonged reaction time, the grain sizes of the QDs became larger and the absorption edges of the CIS QDs showed a red-shift owing to the size-induced quantum confinement effect. For the first＆amp;nbsp;time, DDT-capped CIS QDs with narrow size distribution were connected to the inner surface of mesoporous TiO2 films via a thioglycolic acid （TGA）-assisted adsorption approach, which was simple and easy to carry out. The adsorption behaviors of both TGA and the CIS QDs on the TiO2 films were detected by attenuated total reflectance Fourier transform infrared （ATR-FTIR） spectroscopy. The results indicated that TGA was adsorbed onto the surface of TiO2 via COOH groups while the―SH group was exposed outside, and replaced DDT at the surface of the CIS QDs, leading to the attachment between TiO2 and CIS. It was revealed that the CIS QDs of^3.6 nm in size exhibited the best light absorption capacity and photovoltaic performance. An over-coating of CdS significantly improved the performance of the QDSSCs owing to decreased electron recombination, and a power conversion efficiency of^2.83%was obtained.

关 键 词： 铜铟硫 量子点 敏化太阳电池 多功能耦联剂 巯基乙酸 辅助吸附

领　　域： [理学] [理学]