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Journal Articles Science Year : 2022

Deterministic fabrication of 3D/2D perovskite bilayer stacks for durable and efficient solar cells

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Siraj Sidhik
Michael de Siena
Reza Asadpour
Andrew Torma
Tanguy Terlier
Kevin Ho
Anand Puthirath
Xinting Shuai
Ayush Agrawal
Boubacar Traore
Matthew Jones
Rajiv Giridharagopal
Pulickel Ajayan
Joseph Strzalka
David Ginger
Claudine Katan
Muhammad Alam
Mercouri Kanatzidis

Abstract

Realizing solution-processed heterostructures is a long-enduring challenge in halide perovskites because of solvent incompatibilities that disrupt the underlying layer. By leveraging the solvent dielectric constant and Gutmann donor number, we could grow phase-pure two-dimensional (2D) halide perovskite stacks of the desired composition, thickness, and bandgap onto 3D perovskites without dissolving the underlying substrate. Characterization reveals a 3D–2D transition region of 20 nanometers mainly determined by the roughness of the bottom 3D layer. Thickness dependence of the 2D perovskite layer reveals the anticipated trends for n-i-p and p-i-n architectures, which is consistent with band alignment and carrier transport limits for 2D perovskites. We measured a photovoltaic efficiency of 24.5%, with exceptional stability of T 99 (time required to preserve 99% of initial photovoltaic efficiency) of >2000 hours, implying that the 3D/2D bilayer inherits the intrinsic durability of 2D perovskite without compromising efficiency.
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Dates and versions

hal-03784361 , version 1 (26-09-2022)

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Siraj Sidhik, Yafei Wang, Michael de Siena, Reza Asadpour, Andrew Torma, et al.. Deterministic fabrication of 3D/2D perovskite bilayer stacks for durable and efficient solar cells. Science, 2022, 377 (6613), pp.1425-1430. ⟨10.1126/science.abq7652⟩. ⟨hal-03784361⟩
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