Band-engineering of TiO2 as a wide-band gap semiconductor using organic chromophore dyes

International Conference on Green and Renewable Energy Resources 2016

能源学;生态环境科学

Wahyuningsih, S.^1 ; Kartini, I.^2 ; Ramelan, A.H.^3 ; Saputri, L.N.M.Z.^1 ; Munawaroh, H.^1

Inorganic Material Research Group, Faculty of Mathematics and Natural Sciences, Sebelas Maret University, Indonesia^1

Inorganic Chemistry, Chemistry Department, Faculty of Mathematics and Natural Sciences, Gadjah Mada University, Indonesia^2

Electronic Material and Energy Research Group, Faculty of Mathematics and Natural Sciences, Sebelas Maret University, Indonesia^3

关键词: Charge transfer process;    Chromophore group;    Incident photon-to-current conversion efficiencies;    Long-wavelength absorption;    Organic chromophores;    Photocatalyst activity;    Photonic materials;    Visible light absorption;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/75/1/012003/pdf
DOI  :  10.1088/1755-1315/75/1/012003

学科分类：环境科学（综合）

来源: IOP

【 摘 要 】

Bond-engineering as applied to semiconductor materials refers to the manipulation of the energy bands in order to control charge transfer processes in a device. When the device in question is a photoelectrochemical cell, the charges affected by drift become the focus of the study. The ideal band gap of semiconductors for enhancement of photocatalyst activity can be lowered to match with visible light absorption and the location of conduction Band (CB) should be raised to meet the reducing capacity. Otherwise, by the addition of the chromofor organic dyes, the wide-band gab can be influences by interacation resulting between TiO2 surface and the dyes. We have done the impruvisation wide-band gap of TiO2 by the addition of organic chromophore dye, and the addition of transition metal dopand. The TiO2 morphology influence the light absorption as well as the surface modification. The organic chromophore dye was syntesized by formation complexes compound of Co(PAR)(SiPA)(PAR)= 4-(2-piridylazoresorcinol), SiPA = Silyl propil amine). The result showed that the chromophore groups adsorbed onto TiO2 surface can increase the visible light absorption of wide-band gab semiconductor. Initial absorption of a chromophore will affect light penetration into the material surfaces. The use of photonic material as a solar cell shows this phenomenon clearly from the IPCE (incident photon to current conversion efficiency) measurement data. Organic chromophore dyes of Co(PAR)(SiPA) exhibited the long wavelength absorption character compared to the N719 dye (from Dyesol).