About this Abstract |
Meeting |
MS&T24: Materials Science & Technology
|
Symposium
|
Energy Materials for Sustainable Development
|
Presentation Title |
Rudorffites: Lead-free Perovskite-Inspired Copper Pnictohalides For Next-Generation Photovoltaics |
Author(s) |
Rupam Datta, Alexander Colsmann, Holger Röhm |
On-Site Speaker (Planned) |
Rupam Datta |
Abstract Scope |
“Perovskite-inspired” materials—Rudorffites, particularly those based on bismuth (Bi), already yield promising results. Copper bismuth (Cu-Bi) and silver bismuth (Ag-Bi) Rudorffites offer desirable optoelectronic properties, such as high absorption coefficients in the visible regime and direct optical bandgaps, which enable solar cells with high photocurrents and PCEs. Earlier studies showed melt-crystallization under vacuum in a sealed iodine environment at more than 610°C for synthesizing Cu-Bi rudorffite crystals.
Here, a novel low-temperature solvothermal/hydrothermal synthesis route with temperatures below 150°C is used to obtain Cu-Bi Rudorffite crystals. Powder-XRD and TEM/EDS provide salient structural insights regarding the crystallinity of the crystals. The synthesized crystals enable the fabrication of homogeneous Cu-Bi rudorffite thin films with desired stoichiometries via spin-coating. The films are employed in a layer slack, and the resulting solar cells reach record power conversion efficiencies of 0.65% for Cu-Bi rudorffites. PL peak for this material has been observed at 725nm. |