Back
Not All That Glitters Is Gold: Metal-Migration-Induced Degradation in Perovskite Solar Cells.
Journal article

Not All That Glitters Is Gold: Metal-Migration-Induced Degradation in Perovskite Solar Cells.

  • Domanski K Laboratory for Nanoscale Materials Science, Swiss Federal Laboratories for Materials Science and Technology , CH-8600 Dübendorf, Switzerland.
  • Correa-Baena JP Group for Molecular Engineering of Functional Materials, Institute of Chemical Science and Engineering, École Polytechnique Fédérale de Lausanne , CH-1950 Sion, Switzerland.
  • Mine N Adolphe Merkle Institute, University of Fribourg , CH-1700 Fribourg, Switzerland.
  • Nazeeruddin MK
  • Abate A
  • Saliba M
  • Tress W
  • Hagfeldt A
  • Grätzel M
Show more…
  • 2016-05-18
Published in:
  • ACS nano. - 2016
buffer layers
degradation
gold
metal electrodes
perovskite solar cells
secondary ion mass spectrometry
stability
English Perovskite solar cells (PSCs) have now achieved efficiencies in excess of 22%, but very little is known about their long-term stability under thermal stress. So far, stability reports have hinted at the importance of substituting the organic components, but little attention has been given to the metal contact. We investigated the stability of state-of-the-art PSCs with efficiencies exceeding 20%. Remarkably, we found that exposing PSCs to a temperature of 70 °C is enough to induce gold migration through the hole-transporting layer (HTL), spiro-MeOTAD, and into the perovskite material, which in turn severely affects the device performance metrics under working conditions. Importantly, we found that the main cause of irreversible degradation is not due to decomposition of the organic and hybrid perovskite layers. By introducing a Cr metal interlayer between the HTL and gold electrode, high-temperature-induced irreversible long-term losses are avoided. This key finding is essential in the quest for achieving high efficiency, long-term stable PSCs which, in order to be commercially viable, need to withstand hard thermal stress tests.
Language
  • English
Open access status
closed
Identifiers
Persistent URL
https://sonar.ch/global/documents/166362
Statistics
Document views: 53 File downloads: