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Multimodal microscale imaging of textured perovskite–silicon tandem solar cells

DOI: 10.1021/acsenergylett.1c00568 DOI Help

Authors: Elizabeth M. Tennyson (University of Cambridge) , Kyle Frohna (University of Cambridge) , William K. Drake (University of Cambridge) , Florent Sahli (École Polytechnique Fédérale de Lausanne) , Terry Chien-Jen Yang (École Polytechnique Fédérale de Lausanne) , Fan Fu (École Polytechnique Fédérale de Lausanne) , Jérémie Werner (École Polytechnique Fédérale de Lausanne) , Cullen Chosy (Stanford University) , Alan R. Bowman (University of Cambridge) , Tiarnan A. S. Doherty (University of Cambridge) , Quentin Jeangros (École Polytechnique Fédérale de Lausanne) , Christophe Ballif (École Polytechnique Fédérale de Lausanne) , Samuel D. Stranks (University of Cambridge)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Acs Energy Letters

State: Published (Approved)
Published: May 2021
Diamond Proposal Number(s): 20420

Open Access Open Access

Abstract: Halide perovskite/crystalline silicon (c-Si) tandem solar cells promise power conversion efficiencies beyond the limits of single-junction cells. However, the local light-matter interactions of the perovskite material embedded in this pyramidal multijunction configuration, and the effect on device performance, are not well understood. Here, we characterize the microscale optoelectronic properties of the perovskite semiconductor deposited on different c-Si texturing schemes. We find a strong spatial and spectral dependence of the photoluminescence (PL) on the geometrical surface constructs, which dominates the underlying grain-to-grain PL variation found in halide perovskite films. The PL response is dependent upon the texturing design, with larger pyramids inducing distinct PL spectra for valleys and pyramids, an effect which is mitigated with small pyramids. Further, optimized quasi-Fermi level splittings and PL quantum efficiencies occur when the c-Si large pyramids have had a secondary smoothing etch. Our results suggest that a holistic optimization of the texturing is required to maximize light in- and out-coupling of both absorber layers and there is a fine balance between the optimal geometrical configuration and optoelectronic performance that will guide future device designs.

Journal Keywords: Layers; Light; Solar cells; Perovskites; Materials

Diamond Keywords: Photovoltaics; Semiconductors

Subject Areas: Materials, Energy, Physics

Instruments: I14-Hard X-ray Nanoprobe

Added On: 30/05/2021 20:18


Discipline Tags:

Earth Sciences & Environment Climate Change Energy Sustainable Energy Systems Materials Science Energy Materials Metallurgy Perovskites Physics Surfaces interfaces and thin films

Technical Tags:

Imaging X-ray Fluorescence (XRF)