C60 as an Efficient n-Type Compact Layer in Perovskite Solar Cells.
Organic-inorganic halide perovskite solar cells have rapidly evolved over the last 3 years. There are still a number of issues and open questions related to the perovskite material, such as the phenomenon of anomalous hysteresis in current-voltage characteristics and long-term stability of the devices. In this work, we focus on the electron selective contact in the perovskite solar cells and physical processes occurring at that heterojunction. We developed efficient devices by replacing the commonly employed TiO2 compact layer with fullerene C60 in a regular n-i-p architecture. Detailed spectroscopic characterization allows us to present further insight into the nature of photocurrent hysteresis and charge extraction limitations arising at the n-type contact in a standard device. Furthermore, we show preliminary stability data of perovskite solar cells under working conditions, suggesting that an n-type organic charge collection layer can increase the long-term performance.
†Clarendon Laboratory, University of Oxford, Parks Road, Oxford, OX1 3PU, United Kingdom.
Konrad
K
Wojciechowski
†Clarendon Laboratory, University of Oxford, Parks Road, Oxford, OX1 3PU, United Kingdom.|‡Center for Nano Science and Technology@Polimi, Istituto Italiano di Tecnologia, via Giovanni Pascoli 70/3, 20133, Milan, Italy.
Tomas
T
Leijtens
†Clarendon Laboratory, University of Oxford, Parks Road, Oxford, OX1 3PU, United Kingdom.|§Dipartimento di Fisica, Università della Calabria, via Bucci, Rende, 87036, Italy.
Svetlana
S
Siprova
Christoph
C
Schlueter
†Clarendon Laboratory, University of Oxford, Parks Road, Oxford, OX1 3PU, United Kingdom.
Maximilian T
MT
Hörantner
†Clarendon Laboratory, University of Oxford, Parks Road, Oxford, OX1 3PU, United Kingdom.
Jacob Tse-Wei
JT
Wang
Chang-Zhi
CZ
Li
Alex K-Y
AK
Jen
Tien-Lin
TL
Lee
†Clarendon Laboratory, University of Oxford, Parks Road, Oxford, OX1 3PU, United Kingdom.
Henry J
HJ
Snaith
X-ray photoelectron spectroscopy; fullerene; hysteresis; perovskite solar cell; photoluminescence; power conversion efficiency; stability