Inamdar A I, Mujawar S H, Ganesan V, Patil P S
Thin Film Materials Laboratory, Department of Physics, Shivaji University, Kolhapur 416004, India.
Nanotechnology. 2008 Aug 13;19(32):325706. doi: 10.1088/0957-4484/19/32/325706. Epub 2008 Jul 4.
Zinc oxide (ZnO) thin films were electrodeposited from an aqueous zinc acetate solution onto fluorine-doped thin oxide (FTO) coated conducting glass substrates. The effect of organic surfactants like polyvinyl pyrrolidone (PVP), sodium dodecyl sulfate (SDS), polyethylene glycol (PEG), ethylene glycol (EG) and polyvinyl alcohol (PVA) on their structural, morphological, optical and photoelectrochemical properties was studied. The x-ray diffraction patterns revealed the formation of phase-pure ZnO thin films. The films deposited using organic surfactants exhibit different surface morphologies. It was observed that the organic surfactants play important roles in modifying the surface morphology and size of the crystallites. A compact granular morphology was observed for the ZnO samples grown without organic surfactants. The films exhibit nanoparticles of size 100-150 nm for PVP, EG and PVA mediated growth. The vertically aligned thin and compact hexagonal crystallites stem from the SDS, whereas microporous corrugated morphology is observed for PEG-mediated growth. All the samples exhibit room temperature photoluminescence (PL). Oxygen vacancies contribute to the active luminescent centers for the emission of green light in ZnO thin films. PL gets quenched for the SDS surfactant. All the samples were post-treated with ethanol to remove stray surfactant molecules. FTIR study was used to confirm the removal of adsorbed surfactant molecules from the samples. Moreover the samples are photoelectrochemically (PEC) active and exhibit the highest photocurrent of 231 µA, a photovoltage of 492 mV and 0.42 fill factor for the ZnO:SDS films.
氧化锌（ZnO）薄膜通过在醋酸锌水溶液中进行电沉积，被制备在氟掺杂氧化锡（FTO）涂层的导电玻璃基板上。研究了聚乙烯吡咯烷酮（PVP）、十二烷基硫酸钠（SDS）、聚乙二醇（PEG）、乙二醇（EG）和聚乙烯醇（PVA）等有机表面活性剂对其结构、形态、光学和光电化学性质的影响。X射线衍射图谱表明形成了纯相的ZnO薄膜。使用有机表面活性剂沉积的薄膜呈现出不同的表面形态。据观察，有机表面活性剂在改变微晶的表面形态和尺寸方面起着重要作用。对于未使用有机表面活性剂生长的ZnO样品，观察到致密的颗粒形态。对于PVP、EG和PVA介导生长的薄膜，呈现出尺寸为100 - 150 nm的纳米颗粒。垂直排列的薄且致密的六方微晶源自SDS，而对于PEG介导生长的薄膜，则观察到微孔波纹形态。所有样品均表现出室温光致发光（PL）。氧空位是ZnO薄膜中发射绿光的活性发光中心。对于SDS表面活性剂，PL会猝灭。所有样品均用乙醇进行后处理，以去除残留的表面活性剂分子。傅里叶变换红外光谱（FTIR）研究用于确认从样品中去除了吸附的表面活性剂分子。此外，这些样品具有光电化学（PEC）活性，对于ZnO:SDS薄膜，表现出最高231 µA的光电流、492 mV的光电压和0.42的填充因子。
