Optical and electrical properties of alkaline-doped and As-alloyed amorphous selenium films
Optical and electrical properties of alkaline-doped and As-alloyed amorphous selenium films
复制标题
DOI：
10.1007/s10854-019-01386-x
复制
发表时间：
2019-09-01
影响因子：
2.8
通讯作者：
Kasap, S. O.
中科院分区：
文献类型：
--
作者：
Gunes, O.;Koughia, C.;Kasap, S. O.
已经研究了电气和光学特性CS掺杂的A-SE0.95AS0.05（已稳定AS的A-SE）。正如预期的那样，在CS掺杂膜或散装样品上没有电子顺磁共振信号，这使自旋活性缺陷浓度低于10（15）cm（-3）。 a-se0.95as0.05的CS添加导致A-se0.95as0.05的N型掺杂，从某种意义上说，未掺杂的材料具有Mu（h）tau（h）>> mu（h）>> mu（e）tau（e）tau（e），而碱性掺杂的材料则是mu（e）tau（e）tau（e）tau（e）。 CS添加还导致折射率N的减少和玻璃过渡温度T-G的降低，并影响退火和顺序淬火后A-SE膜厚度的时间弛豫行为。我们已经测量了在室温下在室温下，在玻璃过渡温度以下的温度下，测量了折射率分散剂，N（lambda）与Lambda，BandGap（E-G）和Urbach宽度（E-G）和Urbach宽度（Delta E）。光致发光（PL）实验证实了先前的实验，即PL发射是宽阔的发射光谱，其显着的Stoke移动大致与E-G/2经验规则相似。目前的工作证实了CS掺杂和稳定的A-SE是N型。
Electrical and optical properties Cs-doped a-Se0.95As0.05 (stabilized a-Se that has been alloyed with As) have been investigated. As expected there was no electron paramagnetic resonance signal on Cs-doped films or bulk samples, which put the spin-active defect concentrations below 10(15) cm(-3). The Cs-addition to a-Se0.95As0.05, leads to the n-type doping of a-Se0.95As0.05 in the sense that the undoped material has mu(h)tau(h)>> mu(e)tau(e) whereas the alkaline doped material has mu(e)tau(e)>> mu(h)tau(h). The Cs addition also leads to a reduction of the refractive index n and a reduction of the glass transition temperature T-g, and affects the temporal relaxation behavior of a-Se film thickness after annealing and sequential quenching. We have measured the refractive index dispersion, n(lambda) versus lambda, bandgap (E-g) and Urbach width (Delta E) for undoped and Cs-doped films at room temperature and at a temperature just below the glass transition temperature. The photoluminescence (PL) experiments confirm earlier experiments that the PL emission is a broad emission spectrum with a significant Stoke's shift following roughly the similar to E-g/2 empirical rule. The present work confirms that Cs-doped and As-stabilized a-Se is n-type.