The Effect of Tert-butylammonium Addition in Methylammonium Lead Iodide Perovskite Solar Cells

Conference paper (2019)

Authors

Noor Titan Putri Hartono Massachusetts Institute of Technology
Shijing Sun Massachusetts Institute of Technology
M.C. Gelvez Rueda ChemE/Opto-electronic Materials - AS
Polly J. Pierone Wesleyan University Middletown
Matthew P. 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
F.C. Grozema ChemE/Opto-electronic Materials - AS
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Research Group
ChemE/Opto-electronic Materials (AS) (TU Delft)
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Published Date

2019

Language

English

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Faculty

Applied Sciences

Department

ChemE/Chemical Engineering

Research Group

ChemE/Opto-electronic Materials

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.