摘要:

The influence of the deposition and CdCl2doping conditions on the properties of CdTe layers and on the performance of CdTe/CdS/ITO/glass solar cells is reported. Relatively high deposition temperatures (300-350°C) were found to enhance the reproducibility of the optical quality of the CdTe. Oxidation of CdTe layers during air annealing was observed and monitored by XRD. Conventional wet dip and CdCl2vapour doping of CdTe are compared. Methods for reducing the incidence of pinholes in the CdTe are described, the junction uniformity having been monitored by EBIC. The best solar cell made in this work had an efficiency of 9.87%. (Voc= 0.696V,Jsc= 24.1 mA/cm2, FF = 59%).

ISSN:0142-5919    

DOI:10.1080/01425919908914347

出版商:Taylor & Francis Group    

年代:1999

数据来源: Taylor

摘要:

A comparative study of estimating the day-length,S0, and extraterrestrial radiation,H, is conducted, with special reference to Sudan. Due to the definitions of the formulae of Cooper and Hay, differences inS0-values are normal; however, the former formula revealed excellent agreement with data on the duration between sunrise and sunset. Hence, the paper recommends adopting Cooper's method for computingS0for Sudan. With regard toH0, the use of the average days for the months, as recommended by Klein, has depicted no substantial errors. This has also been found true for day-length computations. The study further accentuates that the amount of solar energy available in Sudan is significantly large to be used for industrial purposes.

ISSN:0142-5919    

DOI:10.1080/01425919908914348

出版商:Taylor & Francis Group    

年代:1999

数据来源: Taylor

摘要:

In this communication, an analysis of an inverted absorber solar still, with water flowing over the condensing surface, has been presented. Analytical expressions for the hourly variation of various temperatures namely, water, condensing cover, and flowing water, the yield and the instantaneous thermal efficiency have been derived in terms of design and climatic parameters. Numerical computation has been carried out for a particular day of Delhi weather for an inverted absorber solar still with water flowing over the condensing cover. The results have been compared with those of an inverted absorber solar still without the water flow over the condensing cover. It is found that for an optimum 10cm depth of water in the basin the yield is increased by about 11 % when there is flow of water at the rate of 0.5kg/s.

ISSN:0142-5919    

DOI:10.1080/01425919908914349

出版商:Taylor & Francis Group    

年代:1999

数据来源: Taylor

摘要:

A new simple model to generate daily averaged point cloudiness values was proposed. The model uses as input the long-term mean value of point cloudiness. The model was tested in two Romanian locations. During the cold season there is a good agreement between the frequency distribution functions (FDF) obtained by using observed and generated data, respectively. When the warm season is considered, the concordance between the FDFs based on synthetic and observed data is slightly worse. The present model generates data whose mean and standard deviation are very close to those of the observed data. The model can be used to synthesize time series in those locations where the long-term mean value of point cloudiness is the only known information about the cloud cover amount. However, if both the long-term mean and standard deviation of point cloudiness are known, one recommends to use first or second order autoregressive (AR) models. If one looks about FDFs based on generated data the present model should be preferred to the usual first and second order AR models.

ISSN:0142-5919    

DOI:10.1080/01425919908914350

出版商:Taylor & Francis Group    

年代:1999

数据来源: Taylor