https://scholars.lib.ntu.edu.tw/handle/123456789/504253
標題: | Effect of chemical structure of interface modifier of TiO2 on photovoltaic properties of poly(3-hexylthiophene)/TiO2 layered solar cells | 作者: | Hsu, C.-W. Wang, L. WEI-FANG SU |
公開日期: | 2009 | 出版社: | Elsevier Inc. | 卷: | 329 | 期: | 1 | 起(迄)頁: | 182-187 | 來源出版物: | Journal of Colloid and Interface Science | 摘要: | Two classes of phosphonic acid-bearing organic molecules, 2-oligothiophene phosphonic acid and ω-(2-thienyl)alkyl phosphonic acid were adopted as interface modifiers (IMs) of the TiO2 surface, to increase its compatibility with poly(3-hexylthiophene) (P3HT). The self-assembled monolayers of these molecules on titania surface were characterized by making contact angle measurements and X-ray photoelectron spectroscopy (XPS). Atomic force microscopic (AFM) images revealed that the adsorption of IMs effectively smoothes the TiO2 surface. Both photoluminescence (PL) spectroscopy and PL lifetime measurements were made to investigate the photoinduced properties of the TiO2/IM/P3HT layered-junction. The PL quenching efficiency increased with the number of thiophene rings and as the alkyl chain-length in IMs decreased. Meanwhile, the decline in the PL lifetime followed a similar trend as the PL quenching efficiency. Additionally, the power conversion efficiency (PCE) of the ITO/TiO2/IM/P3HT/Au devices was examined by measuring their photocurrent density-applied voltage (J - V) curves. The experimental results indicated that the short-circuit current density (JSC) increased with the number of thiophene units and as the hydrocarbon chain-length in IMs decreased. However, the open-circuit voltage (VOC) of the devices slightly fell as the energy level of the highest occupied molecular orbital (HOMO) of IM decreased. The PCE of the device with 2-terthiophene phosphonic acid was 2.5 times that of the device with 10-(2-thienyl)decyl phosphonic acid. © 2008 Elsevier Inc. All rights reserved. |
URI: | https://scholars.lib.ntu.edu.tw/handle/123456789/504253 | ISSN: | 00219797 | DOI: | 10.1016/j.jcis.2008.10.008 | SDG/關鍵字: | Adsorption; Alkylation; Angle measurement; Carrier mobility; Contact angle; Conversion efficiency; Electron energy levels; Hydrocarbons; Light emission; Luminescence; Molecular orbitals; Molecular spectroscopy; Molecules; Monolayers; Organic acids; Organic compounds; Organic polymers; Photoelectron spectroscopy; Photovoltaic cells; Quenching; Self assembled monolayers; Semiconductor quantum wells; Solar cells; Solar energy; Solar equipment; Sulfur compounds; Switching circuits; Thiophene; Titanium dioxide; Titanium oxides; Hybrid solar cells; Interface modification; Poly(3-hexylthiophene); Self-assembled monolayer; TiO2; X ray photoelectron spectroscopy; phosphonic acid derivative; poly(3 hexylthiophene); thiophene; titanium dioxide; unclassified drug; article; atomic force microscopy; chemical structure; contact angle; electric potential; photoluminescence; priority journal; surface property; X ray photoelectron spectroscopy |
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