Impact of In-Situ Cd Saturation MOCVD Grown CdTe Solar Cells on As Doping and VOC
IEEE JOURNAL OF PHOTOVOLTAICS(2022)
摘要
In-situ Cd-saturated growth of polycrystalline CdTe:As thin film was performed by metal organic chemical vapour deposition at a low temperature of 350 °C, to investigate the impact on As doping and device V
OC
. Device characterization showed conversion efficiency of ∼14%, and V
OC
of 772 mV, which is an improvement to the baseline device with CdTe:As absorber layer grown at 390 °C under non-saturated conditions. When the low temperature Cd-saturated growth was combined with chlorine heat treatment at a higher temperature of 440 °C (in contrast with the standard 420 °C) for 10 min, device efficiency improved to ∼17% with a high V
OC
of 877 mV. As a result, ∼100 mV boost in V
OC
from baseline is demonstrated with Cd-saturated CdTe:As device. Micro-photoluminescence and time-resolved photoluminescence measurements performed on these Cd-saturated CdTe:As devices confirmed that minority carrier lifetime significantly improved.
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关键词
As doping,Cd-saturated,CdTe,metal organic chemical vapour deposition (MOCVD),open circuit voltage,solar cells,thin films
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