Influence of composition on the performance of sintered Cu(In,Ga)Se2 nanocrystal thin-film photovoltaic devices.
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abstract
Thin-film photovoltaic devices (PVs) were prepared by selenization using oleylamine-capped Cu(In,Ga)Se2 (CIGS) nanocrystals sintered at a high temperature (>500C) under Se vapor. The device performance varied significantly with [Ga]/[In+Ga] content in the nanocrystals. The highest power conversion efficiency (PCE) observed in the devices studied was 5.1% under air mass 1.5global (AM1.5G) illumination, obtained with [Ga]/[In+Ga]=0.32. The variation in PCE with composition is partly a result of bandgap tuning and optimization, but the main influence of nanocrystal composition appeared to be on the quality of the sintered films. The [Cu]/[In+Ga] content was found to be strongly influenced by the [Ga]/[In+Ga] concentration, which appears to be correlated with the morphology of the sintered film. For this reason, only small changes in the [Ga]/[In+Ga] content resulted in significant variations in device efficiency.
Akhavan, V. A., Harvey, T. B., Stolle, C. J., Ostrowski, D. P., Glaz, M. S., Goodfellow, B. W., ... Korgel, B. A.
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Akhavan, Vahid A||Harvey, Taylor B||Stolle, C Jackson||Ostrowski, David P||Glaz, Micah S||Goodfellow, Brian W||Panthani, Matthew G||Reid, Dariya K||Vanden Bout, David A||Korgel, Brian A
