Graded 2D/3D Perovskite Heterostructure for Efficient and Operationally Stable MA-Free Perovskite Solar Cells

Yao Q, Xue Q, Li Z, Zhang K, Zhang T, Li N, Yang S, Brabec C, Yip HL, Cao Y (2020)

Publication Type: Journal article

Publication year: 2020

Journal

Advanced Materials Wiley

DOI: 10.1002/adma.202000571

Abstract

Almost all highly efficient perovskite solar cells (PVSCs) with power conversion efficiencies (PCEs) of greater than 22% currently contain the thermally unstable methylammonium (MA) molecule. MA-free perovskites are an intrinsically more stable optoelectronic material for use in solar cells but compromise the performance of PVSCs with relatively large energy loss. Here, the open-circuit voltage (V-oc) deficit is circumvented by the incorporation of beta-guanidinopropionic acid (beta-GUA) molecules into an MA-free bulk perovskite, which facilitates the formation of quasi-2D structure with face-on orientation. The 2D/3D hybrid perovskites embed at the grain boundaries of the 3D bulk perovskites and are distributed through half the thickness of the film, which effectively passivates defects and minimizes energy loss of the PVSCs through reduced charge recombination rates and enhanced charge extraction efficiencies. A PCE of 22.2% (certified efficiency of 21.5%) is achieved and the operational stability of the MA-free PVSCs is improved.

Authors with CRIS profile

Kaicheng Zhang Institute Materials for Electronics and Energy Technology (i-MEET) Ning Li Institute Materials for Electronics and Energy Technology (i-MEET) Christoph Brabec Institute Materials for Electronics and Energy Technology (i-MEET)

Involved external institutions

South China University of Technology (SCUT) / 华南理工大学 CN China (CN) Hong Kong University of Science and Technology (HKUST) / 香港科技大學 CN China (CN)

How to cite

APA:

Yao, Q., Xue, Q., Li, Z., Zhang, K., Zhang, T., Li, N.,... Cao, Y. (2020). Graded 2D/3D Perovskite Heterostructure for Efficient and Operationally Stable MA-Free Perovskite Solar Cells. Advanced Materials. https://dx.doi.org/10.1002/adma.202000571

MLA:

Yao, Qin, et al. "Graded 2D/3D Perovskite Heterostructure for Efficient and Operationally Stable MA-Free Perovskite Solar Cells." Advanced Materials (2020).

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