【摘 要】
：
The properties of PbS are potentially applicable to a variety of advanced photovoltaic concepts,including multiple exciton generation (MEG) cells and the hot carrier solar cell (HCSC).The symmetry of
【机 构】
：
The University of New South Wales,Australia
【出 处】
：
SNEC 第七届(2013)国际太阳能产业及光伏工程(上海)论坛
论文部分内容阅读
The properties of PbS are potentially applicable to a variety of advanced photovoltaic concepts,including multiple exciton generation (MEG) cells and the hot carrier solar cell (HCSC).The symmetry of the electronic bandstructure lends itself readily to MEG and the large mass difference between the constituents of the binary compound.In addition to quantum confinement,surface effects are known to contribute significantly to the properties of nanoparticles with diameters similar to their Bohr radius.Here,a simple and general analytical model is employed to estimate the size of surface dipole moments in spherical nanoparticles.This is then used as a correction to an LCAO electronic bandstructure and the resonant atomic vibrations produced within the harmonic approximation.Empirical and ab-initio input parameters are used to produce the bandstructures.The size of electronic and phononic bandgaps are quantitatively assessed with this technique for PbS nanoparticles and nanoparticle superlattices.Confinement effects are explored.Criteria required to produce substantial mini-bands are determined.The modified surface conditions lead to surface states not available in the bulk material.Reasonable agreement is obtained between these semi-empirical results relative to sophisticated density functional theory (DFT) where comparisons can be made.Decay pathways and energy loss mechanisms for advanced photovoltaic cells are discussed qualitatively.
其他文献
沙井llOkV变电站中性点采用经小电阻接地方式接地，通过合理的小电阻接地系统的保护配置以及ENGR-PCS型小电阻成套装置的使用，有效限制了各种系统过电压，特别是对间歇性弧光接地过电压水平的限制。利用大的接地故障电流，可以准确迅速判断出故障线路，实现快速切除故障线路，缩短故障排查时间的目标。因此，中性点经小电阻接地的方式特别适用于沙井变电站改造的要求，具有很强的针对性，同时为系统设备降低绝缘水平创
电网中三相间的不平衡电流是普遍存在的,由于大量单相负荷的存在,三相间的电流不平衡现象尤为严重,三相不平衡对供电系统有很大的危害.自动平衡无功补偿装置是电力供电系统中一种设计新颖、功能完善的新型无功补偿装置,主要应用于三相四线制低压供电系统中,调整不平衡电流和补偿系统无功,保证供用电质量.本装置采用三相电容器补偿方式和单相电容器分相补偿方式，机内装有12台额定电压400V的单相电力电容器，在微机控制
Dielectric coatings in the structure of passivated emitter and rear cell (PERC) are usually designed and fabricated using expensive vacuum deposition processes such as plasma enhanced chemical vapour
SINGULAR is a multi chamber PECVD production tool,which allows to deposit mono or multi layers of different material on silicon solar wafers using an inductively coupled plasma (ICP).Every deposition
Within the last years the effect of potential-induced degradation (PID) has gained a lot of interest because of its strong impact on the reliability of PV installations.Solutions to overcome PID have
The development of high performance solar cells suitable for cost effective and low CTM (cell-to-module)-loss module fabrication is a major goal of current R&D activities.Our approach to achieve this
Photovoltaic devices have a number of fundamental limitations that prevent an efficient use of all sunlight.These include the finite absorption range of the solar cells,thermalization loses and thermo
We report on the surface passivation of inverted pyramidally textured (intex) and isotextured (isotex) crystalline silicon (c-Si) wafers by amorphous silicon nitride (SiNx)and amorphous silicon (a-Si:
The durability of PV modules and their component materials to the stresses in the outdoor environment is the most important indicator of reliability,durability and safety of photovoltaic modules throu
PV competes with conventional and renewable electricity sources.While module prices have been decreased substantially,the cost of installation has declined at a lower rate.Indeed,the largest cost driv