Enhanced photovoltage for inverted planar heterojunction perovskite solar cells

Journal: Science

Published: 2018-06-29

DOI: 10.1126/science.aap9282

Affiliations: 8

Authors: 24

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Research Highlight

Underachieving solar cells get an organic upgrade

© WLADIMIR BULGAR/SCIENCE PHOTO LIBRARY/Getty

© WLADIMIR BULGAR/SCIENCE PHOTO LIBRARY/Getty

Low-cost alternatives to silicon solar cells can attain high efficiencies by simply tweaking their surface chemistry.

Researchers from Peking University have investigated an electronic problem that hinders the light-harvesting performance of perovskites — materials such as lead halides that can be printed, much like ink, onto solar devices.

When perovskites are sandwiched between electrodes in a thin-film solar cell, interfacial defects and impurities can prevent photogenerated charge carriers from contributing to the device’s power output. To control this effect, the researchers coated perovskite thin films with guanidinium, a natural nitrogen-rich ion. Electrical measurements showed that this overlay boosted the maximum solar cell voltage compared to uncoated perovskites.

Surface characterization measurements suggest the organic coating reduces the number of defects and alters the perovskite’s electronic structure to push photogenerated charges away from interfacial regions.

Supported content

  1. Science 360, 1442–1446 (2018). doi: 10.1126/science.aap9282
Institutions FC
State Key Laboratory for Artificial Microstructure and Mesoscopic Physics, PKU, China 0.31
Department of Physics, PKU, China 0.31
Cavendish Laboratory, University of Cambridge, United Kingdom (UK) 0.13
Oxford Department of Physics, United Kingdom (UK) 0.08
Centre for Engineering Materials, University of Surrey, United Kingdom (UK) 0.08
Advanced Technology Institute (ATI), University of Surrey, United Kingdom (UK) 0.04
Collaborative Innovation Center of Quantum Matter (CICQM), China 0.03
Collaborative Innovation Center of Extreme Optics, SXU, China 0.02

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