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Strategically Constructed Bilayer Tin (IV) Oxide as Electron Transport Layer Boosts Performance and Reduces Hysteresis in Perovskite Solar Cells
Author(s) -
Lin Liangyou,
Jones Timothy W.,
Wang Jacob TseWei,
Cook Andre,
Pham Ngoc Duy,
Duffy Noel W.,
Mihaylov Blago,
Grigore Mihaela,
Anderson Kenrick F.,
Duck Benjamin C.,
Wang Hongxia,
Pu Jian,
Li Jian,
Chi Bo,
Wilson Gregory J.
Publication year - 2020
Publication title -
small
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 3.785
H-Index - 236
eISSN - 1613-6829
pISSN - 1613-6810
DOI - 10.1002/smll.201901466
Subject(s) - perovskite (structure) , hysteresis , materials science , bilayer , tin oxide , optoelectronics , energy conversion efficiency , nanotechnology , layer (electronics) , fabrication , photovoltaic system , tin , oxide , indium tin oxide , engineering physics , chemical engineering , doping , condensed matter physics , electrical engineering , chemistry , physics , membrane , medicine , biochemistry , alternative medicine , pathology , engineering , metallurgy
Nanostructured tin (IV) oxide (SnO 2 ) is emerging as an ideal inorganic electron transport layer in n–i–p perovskite devices, due to superior electronic and low‐temperature processing properties. However, significant differences in current–voltage performance and hysteresis phenomena arise as a result of the chosen fabrication technique. This indicates enormous scope to optimize the electron transport layer (ETL), however, to date the understanding of the origin of these phenomena is lacking. Reported here is a first comparison of two common SnO 2 ETLs with contrasting performance and hysteresis phenomena, with an experimental strategy to combine the beneficial properties in a bilayer ETL architecture. In doing so, this is demonstrated to eliminate room‐temperature hysteresis while simultaneously attaining impressive power conversion efficiency (PCE) greater than 20%. This approach highlights a new way to design custom ETLs using functional thin‐film coatings of nanomaterials with optimized characteristics for stable, efficient, perovskite solar cells.