Title
Low-Temperature Plasma-Assisted Atomic-Layer-Deposited SnO2 as an Electron Transport Layer in Planar Perovskite Solar Cells
Author
Kuang, Y.
Zardetto, V.
van Gils, R.
Karwal, S.
Koushik, D.
Verheijen, M.A.
Black, L.E.
Weijtens, C.
Veenstra, S.C.
Andriessen, H.A.J.M.
Kessels, W.M.M.
Creatore, M.
Publication year
2018
Abstract
In this work, we present an extensive characterization of plasma-assisted atomic-layer-deposited SnO2 layers, with the aim of identifying key material properties of SnO2 to serve as an efficient electron transport layer in perovskite solar cells (PSCs). Electrically resistive SnO2 films are fabricated at 50 °C, while a SnO2 film with a low electrical resistivity of 1.8 × 10-3 ω cm, a carrier density of 9.6 × 1019 cm-3, and a high mobility of 36.0 cm2/V s is deposited at 200 °C. Ultraviolet photoelectron spectroscopy indicates a conduction band offset of ∼0.69 eV at the 50 °C SnO2/Cs0.05(MA0.17FA0.83)0.95Pb(I2.7Br0.3) interface. In contrast, a negligible conduction band offset is found between the 200 °C SnO2 and the perovskite. Surprisingly, comparable initial power conversion efficiencies (PCEs) of 17.5 and 17.8% are demonstrated for the champion cells using 15 nm thick SnO2 deposited at 50 and 200 °C, respectively. The latter gains in fill factor but loses in open-circuit voltage. Markedly, PSCs using the 200 °C compact SnO2 retain their initial performance at the maximum power point over 16 h under continuous one-sun illumination in inert atmosphere. Instead, the cell with the 50 °C SnO2 shows a decrease in PCE of approximately 50%. © 2018 American Chemical Society.
Subject
atomic layer deposition
inorganic electron transport layer
interface
perovskite solar cells
stability
tin oxide
Conduction bands
Electron transport properties
Open circuit voltage
Perovskite
Solar cells
Temperature
Ultraviolet photoelectron spectroscopy
Atomic layer deposited
Conduction band offset
Electron transport layers
Inert atmospheres
Low temperature plasmas
Maximum power point
One-sun illumination
Power conversion efficiencies
Perovskite solar cells
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http://resolver.tudelft.nl/uuid:63aa92ba-2721-4e3f-b9ef-89db05f9dde3
TNO identifier
842617
Publisher
American Chemical Society
ISSN
1944-8244
Source
ACS Applied Materials and Interfaces, 10 (10), 30367-30378
Document type
article