title: Influence of composition on the performance of sintered Cu(In,Ga)Se2 nanocrystal thin-film photovoltaic devices.
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.
authors: Department of Chemical Engineering, The University of Texas at Austin, Austin, Texas 78712, USA.
authors: Vahid A
authors: VA
authors: Akhavan
authors: Taylor B
authors: TB
authors: Harvey
authors: C Jackson
authors: CJ
authors: Stolle
authors: David P
authors: DP
authors: Ostrowski
authors: Micah S
authors: MS
authors: Glaz
authors: Brian W
authors: BW
authors: Goodfellow
authors: Matthew G
authors: MG
authors: Panthani
authors: Dariya K
authors: DK
authors: Reid
authors: David A
authors: DA
authors: Vanden Bout
authors: Brian A
authors: BA
authors: Korgel
mesh_terms: D003300:Copper / Q000737:chemistry*; D004553:Electric Conductivity; D011211:Electric Power Supplies; D005708:Gallium / Q000737:chemistry*; D007204:Indium / Q000737:chemistry*; D053758:Nanoparticles / Q000737:chemistry*; D012643:Selenium / Q000737:chemistry*; D012993:Solar Energy
chemical_list: D007204:Indium; D003300:Copper; D005708:Gallium; D012643:Selenium