Jump to main content
Jump to site search

Issue 7, 2020
Previous Article Next Article

In situ growth of a 2D/3D mixed perovskite interface layer by seed-mediated and solvent-assisted Ostwald ripening for stable and efficient photovoltaics

Author affiliations

Abstract

2D/3D mixed perovskites have been recognized as very promising materials for simultaneously achieving high efficiency and stability in solar cells. In this work, we developed a seed-mediated and solvent-assisted Ostwald ripening method to form 2D PEA2PbI4 with a gradient distribution in the underlying 3D perovskite layer by a two-step deposition process with DMF as an additive. Using this method, the reaction of PEAI with MAPbI3 seed grains is prone to produce pure PEA2PbI4 which gives a graduated cladding on the 3D perovskite grains rather than a traditional 2D/3D planar heterostructured perovskite. We demonstrate that this type of perovskite simultaneously delivers a better optical performance and a higher stability than traditional perovskites. The devices made by our method exhibit an average enhancement of 15.5% in power conversion efficiency (PCE) compared with the perovskite solar cells (PSCs) made with 2D/3D planar heterojunction perovskites. Besides, the PCE of the proposed cell without encapsulation remains at above 88% of its original value after 15 days of storage in an air environment at 35–55% humidity, which is higher than the 83% delivered by the 2D/3D planar heterojunction PSCs. Moreover, this kind of cell shows superior operational stability at maximum power under AM 1.5G illumination at 100 mW cm−2 over 1 h relative to the regular 3D PSCs. Our results demonstrate an important strategy for the preparation of highly efficient and stable PSCs for future photovoltaic applications.

Graphical abstract: In situ growth of a 2D/3D mixed perovskite interface layer by seed-mediated and solvent-assisted Ostwald ripening for stable and efficient photovoltaics

Back to tab navigation

Supplementary files

Article information


Submitted
22 Sep 2019
Accepted
30 Dec 2019
First published
31 Dec 2019

J. Mater. Chem. C, 2020,8, 2425-2435
Article type
Paper

In situ growth of a 2D/3D mixed perovskite interface layer by seed-mediated and solvent-assisted Ostwald ripening for stable and efficient photovoltaics

S. Li, L. Hu, C. Zhang, Y. Wu, Y. Liu, Q. Sun, Y. Cui, Y. Hao and Y. Wu, J. Mater. Chem. C, 2020, 8, 2425
DOI: 10.1039/C9TC05212G

Social activity

Search articles by author

Spotlight

Advertisements