Influence of Composition on the Performance of Sintered Cu(In,Ga)Se2 Nanocrystal Thin‐Film Photovoltaic Devices Academic Article uri icon

abstract

  • Thin-film photovoltaic devices (PVs) were prepared by selenization using oleylamine-capped Cu(In,Ga)Se2 (CIGS) nanocrystals sintered at a high temperature (>500 °C) 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 1.5 global (AM 1.5 G) 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.

author list (cited authors)

  • Akhavan, V. A., Harvey, T. B., Stolle, C. J., Ostrowski, D. P., Glaz, M. S., Goodfellow, B. W., ... Korgel, B. A.

citation count

  • 24

publication date

  • February 2013

publisher