Enhanced photovoltage for inverted planar heterojunction perovskite solar cells
- 29 June 2018
- journal article
- research article
- Published by American Association for the Advancement of Science (AAAS) in Science
- Vol. 360 (6396), 1442-1446
- https://doi.org/10.1126/science.aap9282
Abstract
The highest power conversion efficiencies (PCEs) reported for perovskite solar cells (PSCs) with inverted planar structures are still inferior to those of PSCs with regular structures, mainly because of lower open-circuit voltages (Voc). Here we report a strategy to reduce nonradiative recombination for the inverted devices, based on a simple solution-processed secondary growth technique. This approach produces a wider bandgap top layer and a more n-type perovskite film, which mitigates nonradiative recombination, leading to an increase in Voc by up to 100 millivolts. We achieved a high Voc of 1.21 volts without sacrificing photocurrent, corresponding to a voltage deficit of 0.41 volts at a bandgap of 1.62 electron volts. This improvement led to a stabilized power output approaching 21% at the maximum power point.This publication has 49 references indexed in Scilit:
- Electronic Properties of Meso-Superstructured and Planar Organometal Halide Perovskite Films: Charge Trapping, Photodoping, and Carrier MobilityACS Nano, 2014
- Controllable Self-Induced Passivation of Hybrid Lead Iodide Perovskites toward High Performance Solar CellsNano Letters, 2014
- High Photoluminescence Efficiency and Optically Pumped Lasing in Solution-Processed Mixed Halide Perovskite SemiconductorsThe Journal of Physical Chemistry Letters, 2014
- Efficient planar heterojunction perovskite solar cells by vapour depositionNature, 2013
- Sequential deposition as a route to high-performance perovskite-sensitized solar cellsNature, 2013
- Coherent X-ray diffraction imaging of strain at the nanoscaleNature Materials, 2009
- Microstrain and grain-size analysis from diffraction peak width and graphical derivation of high-pressure thermomechanicsJournal of Applied Crystallography, 2008
- Reciprocity relation between photovoltaic quantum efficiency and electroluminescent emission of solar cellsPhysical Review B, 2007
- An improved experimental determination of external photoluminescence quantum efficiencyAdvanced Materials, 1997
- X-ray line broadening from filed aluminium and wolframActa Metallurgica, 1953