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Nanoscale chemical heterogeneity dominates the optoelectronic response of alloyed perovskite solar cells

DOI: 10.1038/s41565-021-01019-7 DOI Help

Authors: Kyle Frohna (University of Cambridge) , Miguel Anaya (University of Cambridge) , Stuart Macpherson (University of Cambridge) , Jooyoung Sung (University of Cambridge) , Tiarnan A. S. Doherty (University of Cambridge) , Yu-Hsien Chiang (University of Cambridge) , Andrew J. Winchester (Okinawa Institute of Science and Technology Graduate University) , Kieran W. P. Orr (University of Cambridge) , Julia E. Parker (Diamond Light Source) , Paul D. Quinn (Diamond Light Source) , Keshav M. Dani (Okinawa Institute of Science and Technology Graduate University) , Akshay Rao (University of Cambridge) , Samuel D. Stranks (University of Cambridge)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Nature Nanotechnology , VOL 120

State: Published (Approved)
Published: November 2021
Diamond Proposal Number(s): 19023 , 20420

Abstract: Halide perovskites perform remarkably in optoelectronic devices. However, this exceptional performance is striking given that perovskites exhibit deep charge-carrier traps and spatial compositional and structural heterogeneity, all of which should be detrimental to performance. Here, we resolve this long-standing paradox by providing a global visualization of the nanoscale chemical, structural and optoelectronic landscape in halide perovskite devices, made possible through the development of a new suite of correlative, multimodal microscopy measurements combining quantitative optical spectroscopic techniques and synchrotron nanoprobe measurements. We show that compositional disorder dominates the optoelectronic response over a weaker influence of nanoscale strain variations even of large magnitude. Nanoscale compositional gradients drive carrier funnelling onto local regions associated with low electronic disorder, drawing carrier recombination away from trap clusters associated with electronic disorder and leading to high local photoluminescence quantum efficiency. These measurements reveal a global picture of the competitive nanoscale landscape, which endows enhanced defect tolerance in devices through spatial chemical disorder that outcompetes both electronic and structural disorder.

Journal Keywords: Characterization and analytical techniques; Solar cells; Ultrafast lasers

Diamond Keywords: Photovoltaics; Semiconductors

Subject Areas: Materials, Chemistry, Energy

Instruments: I14-Hard X-ray Nanoprobe

Added On: 24/11/2021 10:13

Discipline Tags:

Earth Sciences & Environment Sustainable Energy Systems Energy Climate Change Physical Chemistry Energy Materials Chemistry Materials Science Nanoscience/Nanotechnology Perovskites Metallurgy

Technical Tags:

Diffraction Imaging X-ray Fluorescence (XRF)