Effect of annealing temperature on nano-crystalline TiO2 for solar cell applications

被引：24
|
作者：
Malevu, T. D. [1 ]
Mwankemwa, B. S. [2 ,3 ]
Motloung, S., V [4 ]
Tshabalala, K. G. [5 ]
Ocaya, R. O. [5 ]
机构：
[1] Univ KwaZulu Natal, Sch Chem & Phys, Westville Campus,Private Bag X54001, ZA-4000 Durban, South Africa
[2] Univ Pretoria, Dept Phys, P Bag X20, Hatfield, South Africa
[3] Univ Dodoma, Coll Nat & Math Sci, Sch Phys Sci, Dept Phys, POB 338, Dodoma, Tanzania
[4] NMMU, Dept Phys, POB 77000, ZA-6031 Port Elizabeth, South Africa
[5] Univ Free State, Dept Phys, P Bag X13, ZA-9866 Phuthaditjhaba, South Africa
来源：
PHYSICA E-LOW-DIMENSIONAL SYSTEMS & NANOSTRUCTURES | 2019年 / 106卷
基金：
新加坡国家研究基金会;
关键词：
Anatase TiO2 nanocrystals; Annealing temperature; Phase transformation; Hydrothermal crystal growth; EXPOSED; 001; FACETS; ANATASE; NANOSHEETS;
D O I：
10.1016/j.physe.2018.10.028
中图分类号：
TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
This study investigates the effect of annealing temperature (AT) on structure, morphology and optical properties of hydrothermally synthesized TiO2 nanocrystals. Selected-Area Diffraction (SAED) confirmed high quality monocrystals. XRD and Raman spectroscopy indicate only anatase and rutile phases. At high temperature, the (101) and (001) are preferred. PL emission peaks appear at 407, 416 and 493 nm, which can be attributed to photo-excited electron-hole pairs, band-edge excitons and oxygen vacancy defects, respectively. UV-Vis spectroscopy indicates that AT over the 200-600 degrees C temperature range causes the band gap to decrease from 3.08 eV to 2.73 eV. Hydrothermal synthesis followed by annealing at 600 degrees C is found to be a good route for high-purity, nanocrystalline anatase-phase TiO2 with the preferred {001} orientation that is thought to enhance solar cell performance.
引用
收藏
页码：127 / 132
页数：6
相关论文
共 50 条
  • [21] The Character of Photo-electrochemistry of Palladium Implanted TiO2 Nano-crystalline Electrode
    Cun Zhong ZHANG1
    Chinese Chemical Letters, 2001, (01) : 73 - 74
  • [22] A comparative study of the photo-catalytic performance of amorphous and nano-crystalline TiO2
    Molea, A.
    Popescu, V.
    Rowson, N. A.
    OPTOELECTRONICS AND ADVANCED MATERIALS-RAPID COMMUNICATIONS, 2015, 9 (3-4): : 431 - 435
  • [23] Influence of pH on the formulation of TiO2 nano-crystalline powders with high photocatalytic activity
    Molea, Andreia
    Popescu, Violeta
    Rowson, Neil A.
    Dinescu, Adrian M.
    POWDER TECHNOLOGY, 2014, 253 : 22 - 28
  • [24] The character of photo-electrochemistry of palladium implanted TiO2 nano-crystalline electrode
    Zhang, CZ
    Yang, J
    Wu, ZD
    Cai, SM
    Gao, EQ
    CHINESE CHEMICAL LETTERS, 2001, 12 (01) : 73 - 74
  • [25] A study of DSC using ultrasonic and thermal treatment on nano-crystalline TiO2 surface
    Hong, Ji-Tae
    Seo, Hyun-Woong
    Sim, Ji-Young
    Kim, Hee-Je
    PROCEEDINGS OF ISES SOLAR WORLD CONGRESS 2007: SOLAR ENERGY AND HUMAN SETTLEMENT, VOLS I-V, 2007, : 1690 - 1694
  • [26] Micro arc oxidation of nano-crystalline Ag-doped TiO2 semiconductors
    Bayati, M. R.
    Aminzare, M.
    Molaei, Roya
    Sadrnezhaad, S. K.
    MATERIALS LETTERS, 2011, 65 (05) : 840 - 842
  • [27] Conversion of Formic Acid on Single- and Nano-Crystalline Anatase TiO2(101)
    Petrik, Nikolay G.
    Wang, Yang
    Wen, Bo
    Wu, Yiqing
    Ma, Runze
    Dahal, Arjun
    Gao, Feng
    Rousseau, Roger
    Wang, Yong
    Kimmel, Greg A.
    Selloni, Annabella
    Dohnalek, Zdenek
    JOURNAL OF PHYSICAL CHEMISTRY C, 2021, 125 (14): : 7686 - 7700
  • [28] Solution processed polymer tandem cell utilizing organic layer coated nano-crystalline TiO2 as interlayer
    Chung, Won-Suk
    Lee, Hyunjung
    Lee, Wonmok
    Ko, Min Jae
    Park, Nam-Gyu
    Ju, Byeong-Kwon
    Kim, Kyungkon
    ORGANIC ELECTRONICS, 2010, 11 (04) : 521 - 528
  • [29] Effect of Low Temperature Annealing on Anatase TiO2 Layer as Photoanode for Dye-Sensitized Solar Cell
    Noorasid, Nur Syamimi
    Arith, Faiz
    Mustafa, Ahmad Nizamuddin
    Azam, Mohd Asyadi
    Suhaimy, Syazwan Hanani Meriam
    Al-Ani, Oras A.
    PRZEGLAD ELEKTROTECHNICZNY, 2021, 97 (10): : 12 - 16
  • [30] Characteristics of Nano-crystalline TiO2 Dye-sensitized Solar Cells having Counter Electrodes with Different Preparing Process
    Lee, Dong-Yoon
    Koo, Bo-Kun
    Kim, Hyun-Ju
    Lee, Won-Jae
    Song, Jae-Sung
    Kim, Hee-Jae
    TRANSACTIONS ON ELECTRICAL AND ELECTRONIC MATERIALS, 2005, 6 (05) : 238 - 242
12345