Intact 2D/3D halide junction perovskite solar cells via solid-phase in-plane growth

The solution process has been employed to obtain Ruddlesden–Popper two-dimensional/three-dimensional (2D/3D) halide perovskite bilayers in perovskite solar cells for improving the efficiency and chemical stability; however, the solution process has limitations in achieving thermal stability and desi...

Full description

Saved in:
Bibliographic Details
Published in:Nature energy 2021-01, Vol.6 (1), p.63-71
Main Authors: Jang, Yeoun-Woo, Lee, Seungmin, Yeom, Kyung Mun, Jeong, Kiwan, Choi, Kwang, Choi, Mansoo, Noh, Jun Hong
Format: Article
Language:English
Subjects:
639/301/299
639/4077/909/4101/4096/946
Bilayers
Dimensional stability
Economics and Management
Efficiency
Electric fields
Energy
Energy Policy
Energy Storage
Energy Systems
Heterojunctions
Open circuit voltage
Perovskites
Photovoltaic cells
Relative humidity
Renewable and Green Energy
Solar cells
Solid phases
Thermal stability
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:The solution process has been employed to obtain Ruddlesden–Popper two-dimensional/three-dimensional (2D/3D) halide perovskite bilayers in perovskite solar cells for improving the efficiency and chemical stability; however, the solution process has limitations in achieving thermal stability and designing a proper local electric field for efficient carrier collection due to the formation of a metastable quasi-2D perovskite. Here we grow a stable and highly crystalline 2D (C 4 H 9 NH 3 ) 2 PbI 4 film on top of a 3D film using a solvent-free solid-phase in-plane growth, which could result in an intact 2D/3D heterojunction. An enhanced built-in potential is achieved at the 2D/3D heterojunction with a thick 2D film, resulting in high photovoltage in the device. The intact 2D/3D heterojunction endow the devices with an open-circuit voltage of 1.185 V and a certified steady-state efficiency of 24.35%. The encapsulated device retained 94% of its initial efficiency after 1,056 h under the damp heat test (85 °C/85% relative humidity) and 98% after 1,620 h under full-sun illumination. Two-dimensional structures introduced into perovskite solar cells improve performance yet their morphological and dimensional control remains challenging. Jang et al. devise a solid-phase approach to grow phase-pure two-dimensional perovskites over bulk perovskite, which affords greater device efficiency and stability.
ISSN:2058-7546
2058-7546
DOI:10.1038/s41560-020-00749-7