Room‐Temperature Atomic‐Layer‐Deposited Al2O3 Improves the Efficiency of Perovskite Solar Cells over Time

Electrical characterisation of perovskite solar cells consisting of room‐temperature atomic‐layer‐deposited aluminium oxide (RT‐ALD‐Al2O3) film on top of a methyl ammonium lead triiodide (CH3NH3PbI3) absorber showed excellent stability of the power conversion efficiency (PCE) over a long time. Under...

Full description

Saved in:
Bibliographic Details
Published in:ChemSusChem 2018-10, Vol.11 (20), p.3640-3648
Main Authors: Kot, Malgorzata, Kegelmann, Lukas, Das, Chittaranjan, Kus, Peter, Tsud, Nataliya, Matolinova, Iva, Albrecht, Steve, Matolin, Vladimir, Schmeisser, Dieter
Format: Article
Language:English
Subjects:
Aluminum oxide
Atomic layer epitaxy
Energy conversion efficiency
perovskite
Perovskites
photoelectron spectroscopy
Photovoltaic cells
Room temperature
Solar cells
Stability
thin films
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:Electrical characterisation of perovskite solar cells consisting of room‐temperature atomic‐layer‐deposited aluminium oxide (RT‐ALD‐Al2O3) film on top of a methyl ammonium lead triiodide (CH3NH3PbI3) absorber showed excellent stability of the power conversion efficiency (PCE) over a long time. Under the same environmental conditions (for 355 d), the average PCE of solar cells without the ALD layer decreased from 13.6 to 9.6 %, whereas that of solar cells containing 9 ALD cycles of depositing RT‐ALD‐Al2O3 on top of CH3NH3PbI3 increased from 9.4 to 10.8 %. Spectromicroscopic investigations of the ALD/perovskite interface revealed that the maximum PCE with the ALD layer is obtained when the so‐called perovskite cleaning process induced by ALD precursors is complete. The PCE enhancement over time is probably related to a self‐healing process induced by the RT‐ALD‐Al2O3 film. This work may provide a new direction for further improving the long‐term stability and performance of perovskite solar cells. Layer by layer: Applying 9 cycles of atomic layer deposition (ALD) of Al2O3 on top of the lead triiodide CH3NH3PbI3 absorber in perovskite solar cells results in excellent stability of the power conversion efficiency (PCE) over a long time. Thus, under the same environmental conditions, the PCE of solar cells without the Al2O3 layer decreases, whereas that of solar cells with Al2O3 on top of CH3NH3PbI3 increases.
ISSN:1864-5631
1864-564X
DOI:10.1002/cssc.201801434