Quantum Dots Supply Bulk- and Surface-Passivation Agents for Efficient and Stable Perovskite Solar Cells
Xiaopeng Zheng a, Joel Troughton a, Nicola Gasparini a, Yuanbao Lin a, Mingyang Wei b, Yi Hou b, Edward Sargent b, Osman Bakr b
a Division of Physical Sciences and Engineering, King Abdullah University of Science and Technology (KAUST), Thuwal 23955-6900, Kingdom of Saudi Arabia
b Department of Electrical and Computer Engineering, University of Toronto, 10 King's College Road, Toronto, Ontario, M5S 3G4, Canada
Poster, Xiaopeng Zheng, 064
Publication date: 14th October 2019

 

Abstract

 

Defect passivation and surface modification of hybrid perovskite films are essential to achieving high power conversion efficiency (PCE) and stable perovskite photovoltaics. Here, we demonstrate a facile strategy that combines high PCE with high stability in CH3NH3PbI3 (MAPbI3) solar cells. The strategy utilizes inorganic perovskite quantum dots (QDs) to distribute elemental dopants uniformly across the MAPbI3 film and attach ligands to the film’s surface. Compared with pristine MAPbI3 films, MAPbI3 films processed with QDs show a reduction in tail states, smaller trap-state density, and an increase in carrier recombination lifetime. This strategy results in reduced voltage losses and an improvement in PCE from 18.3% to 21.5%, which is among the highest efficiencies for MAPbI3 devices. Ligands introduced with the aid of the QDs render the perovskite film’s surface hydrophobic—inhibiting moisture penetration. The devices maintain 80% of their initial PCE under 1-sun continuous illumination for 500 h and show improved thermal stability.

 

Highlights

 

• QDs distribute their elements and ligands to a perovskite film’s bulk and surface

 

• Elements and ligands as bulk and surface passivators enhance device photo-voltage

 

• MAPbI3 PSCs with CsPbBrCl2 QDs achieve improved efficiency (21.5%) and stability

  

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