title: Flexible high power-per-weight perovskite solar cells with chromium oxide-metal contacts for improved stability in air.
abstract: Photovoltaic technology requires light-absorbing materials that are highly efficient, lightweight, low cost and stable during operation. Organolead halide perovskites constitute a highly promising class of materials, but suffer limited stability under ambient conditions without heavy and costly encapsulation. Here, we report ultrathin (3 μm), highly flexible perovskite solar cells with stabilized 12% efficiency and a power-per-weight as high as 23 W g(-1). To facilitate air-stable operation, we introduce a chromium oxide-chromium interlayer that effectively protects the metal top contacts from reactions with the perovskite. The use of a transparent polymer electrode treated with dimethylsulphoxide as the bottom layer allows the deposition-from solution at low temperature-of pinhole-free perovskite films at high yield on arbitrary substrates, including thin plastic foils. These ultra-lightweight solar cells are successfully used to power aviation models. Potential future applications include unmanned aerial vehicles-from airplanes to quadcopters and weather balloons-for environmental and industrial monitoring, rescue and emergency response, and tactical security applications.
authors: Department of Soft Matter Physics, Johannes Kepler University Linz, Altenbergerstrasse 69, 4040 Linz, Austria.
authors: Martin
authors: M
authors: Kaltenbrunner
authors: Linz Institute for Organic Solar Cells (LIOS), Institute of Physical Chemistry, Johannes Kepler University Linz, Altenbergerstrasse 69, 4040 Linz, Austria.
authors: Getachew
authors: G
authors: Adam
authors: Linz Institute for Organic Solar Cells (LIOS), Institute of Physical Chemistry, Johannes Kepler University Linz, Altenbergerstrasse 69, 4040 Linz, Austria.
authors: Eric Daniel
authors: ED
authors: Głowacki
authors: Department of Soft Matter Physics, Johannes Kepler University Linz, Altenbergerstrasse 69, 4040 Linz, Austria.
authors: Michael
authors: M
authors: Drack
authors: Department of Soft Matter Physics, Johannes Kepler University Linz, Altenbergerstrasse 69, 4040 Linz, Austria.
authors: Reinhard
authors: R
authors: Schwödiauer
authors: Linz Institute for Organic Solar Cells (LIOS), Institute of Physical Chemistry, Johannes Kepler University Linz, Altenbergerstrasse 69, 4040 Linz, Austria.
authors: Lucia
authors: L
authors: Leonat
authors: Linz Institute for Organic Solar Cells (LIOS), Institute of Physical Chemistry, Johannes Kepler University Linz, Altenbergerstrasse 69, 4040 Linz, Austria.
authors: Dogukan Hazar
authors: DH
authors: Apaydin
authors: Institute of Semiconductor and Solid State Physics, Johannes Kepler University Linz, Altenbergerstrasse 69, 4040 Linz, Austria.
authors: Heiko
authors: H
authors: Groiss
authors: Linz Institute for Organic Solar Cells (LIOS), Institute of Physical Chemistry, Johannes Kepler University Linz, Altenbergerstrasse 69, 4040 Linz, Austria.
authors: Markus Clark
authors: MC
authors: Scharber
authors: Linz Institute for Organic Solar Cells (LIOS), Institute of Physical Chemistry, Johannes Kepler University Linz, Altenbergerstrasse 69, 4040 Linz, Austria.
authors: Matthew Schuette
authors: MS
authors: White
authors: Linz Institute for Organic Solar Cells (LIOS), Institute of Physical Chemistry, Johannes Kepler University Linz, Altenbergerstrasse 69, 4040 Linz, Austria.
authors: Niyazi Serdar
authors: NS
authors: Sariciftci
authors: Department of Soft Matter Physics, Johannes Kepler University Linz, Altenbergerstrasse 69, 4040 Linz, Austria.
authors: Siegfried
authors: S
authors: Bauer