The Effect of Tert-butylammonium Addition in Methylammonium Lead Iodide Perovskite Solar Cells
Noor Titan Putri Hartono (Massachusetts Institute of Technology)
Shijing Sun (Massachusetts Institute of Technology)
Maria Gelvez-Rueda (TU Delft - ChemE/Opto-electronic Materials)
Polly Pierone (Wesleyan University Middletown)
Matthew Erodici (Wesleyan University Middletown)
Jason Yoo (Massachusetts Institute of Technology)
Fengxia Wei (A*STAR Computational Resource Centre (A*CRC))
Moungi Bawendi (Massachusetts Institute of Technology)
Ferdinand Grozema (TU Delft - ChemE/Opto-electronic Materials)
undefined More Authors (External organisation)
More Info
expand_more
Abstract
Although methylammonium lead iodide (MAPI) perovskite solar cells have reached efficiencies above 20%, the material is environmentally unstable. Mixing MAPI with lower dimensional (LD) perovskites has been suggested to improve its stability in recent studies. However, the LD-mixed perovskites have lower device performance, likely as a result of limited charge-carrier mobility due to their decreased structural dimensionality. To understand this effect, we mixed large-A-site cation LD perovskites, tert-butylammonium lead iodide, with MAPI, and performed a device performance diagnostics. The results suggested although the charge-carrier lifetime was improved, the mobility decreased by a factor of 20. This contributed to a reduction in device efficiency by 2 orders of magnitude, indicating that mobility plays an important role in 3D/LD perovskite mixtures.