Photovoltaic Characteristics of Low Concentration CdTe Solar Cells

CdTe Photovoltaic Devices for Solar Cell Applications

Cadmium telluride (CdTe) has been recognized as a promising photovoltaic material for thin-film solar cells because of its near optimum bandgap of ~1.5 eV and high absorption coefficient. The energy gap is near optimum for a single junction solar cell and the high absorption coefficient allows films as thin as 2 μm to absorb more than 98% of the above-bandgap radiation. Cells with efficiencies ...

Key Aspects of CdTe/CdS Solar Cells

Recent developments in the following areas are briefly reviewed: a) the electrical structure of grain boundaries in CdTe absorbers, b) impurities and non-stoichiometry in CdTe solar cells and c) use of Sb2Te3 in contacts to CdTe. Nominally identical solar cells fabricated using 99.999% pure CdTe feedstock from two different suppliers were compared. Differences in the photovoltaic response and a...

Preparation and Characterization of CdTe Solar Cells

Current Transients in CdS/CdTe Solar Cells

Current transient responses to voltage and illumination steps are investigated to elucidate the mechanisms involved in carrier transport in CdS/CdTe cells. For most cells, the response to a dark, forward-bias step after a long dark soak at zero bias is a current growth curve For one such cell, the magnitude of the transient is ≈ 22% of the starting value with half of the growth occurring within...

NUMERICAL MODELLING OF ac-CHARACTERISTICS OF CdTe AND CIS SOLAR CELLS

A complete electrical characterisation of thin film solar cells necessitates the analysis of capacitance vs. voltage measurements at different frequencies and illumination intensities. We developed a fully numerical device simulation tool for polycrystalline CdTe and CulnSe, solar cells, which carries out frequency domain calculations. Numerical simulations of /(V) and C(V) characteristics of C...