Preparation Of Quantum Dot Sensitized TiO₂ Nanorods Array And Application In Solar Cells

Compared with the traditional mixed structure hybrid solar cells,ordered structure hybrid solar cell not only has a strong light absorption but also can provide a continuous carrier transfer channel,so it received extensive attention in recent years.In this paper,ordered TiO2 nanorod arrays was prepared on FTO conductive glass by hydrothermal method,and then CdS and Sb2S3 quantum dots were deposited on TiO2 nanorod arrays by using successive ion layer absorption.The quantum dots sensitized solar cells by using the QDs sensitized TiO2 nanorod arrays and containing nitro polyphenyl viylene(PPV)were also prepared and characterized by the Uv-vis absorption spectroscopy,I-V characteristic curve.The main results are as follows:(1)The TiO2 nanorods was prepared by hydrothermal method on conductive glass FTO,four factors were explored,include the seed layer,reaction time,concentration,and the kinds of FTO substrate placed way.TiO2 nanorods were synthesized on the gel immersion seed layer by hydrothermal method at 150? for 12 h,with the concentration ratio of water,hydrochloric acid,tetrabutyl titanate being 30:30:1,and FTO substrate with a conductive surface level down.The characterization analysis results showed that their great length is 1.7 ?m,diameter is 120 nm and the largest light response wavelength is 400 nm.So the TiO2 nanorods is suitable for the next preparation of hybrid solar cells.(2)CdS and Sb2S3 QDss were prepared on TiO2 nanorod arrays in the way of successive ionic layer adsorption.From the test results we can know that the core-shell structure composed of Sb2S3/CdS/TiO2 has a wide range of light absorption,the biggest photovoltaic performance and achieve maximum light absorption wavelength 580 nm when the number of CdS quantum dots are deposited five times and Sb2S3 quantum dots are deposited for 2 times.(3)Polymer A1(0.2 mmol 1,3,5-tris(bromomethyl)-2-nitrobenzene and 0.6 mmol 1,4-dibromomethyl-2-methoxy-5-(2'-ethyl)hexyloxy benzene copolymerization)was spin-coated on the Sb2S3(2)/CdS(5)/TiO2 NRAs array.And then,the A1-Sb2S3(2)/CdS(5)/TiO2 NRAs core-shell one-dimensional ordered structure solar cells were assembled.The conditions of the reactant concentration and the kind of polymers(A1,A2,A3 and MEH-PPV)were optimized.The I-V characterization results showed that the maximum efficiency of the order hybrid solar was 0.20%.The corresponding Jsc was 1.399 mA/cm2,Voc was 0.352 V.Hybrid solar cells with common electron donors MEH-PPV polymers and Sb2S3(2)/CdS(5)/TiO2 NRAs was assembled,and the efficiency was 0.16%,which was slightly lower than that of A1,A1 as electron donors has extensive application value in the field of solar cells.