High-phase purity two-dimensional perovskites with 17.3% efficiency enabled by interface engineering of hole transport layer

Citation:

Sidhik, S. ; Wang, Y. ; Li, W. ; Zhang, H. ; Zhong, X. ; Agrawal, A. ; Hadar, I. ; Spanopoulos, I. ; Mishra, A. ; Traore, B. ; et al. High-phase purity two-dimensional perovskites with 17.3% efficiency enabled by interface engineering of hole transport layer. CELL REPORTS PHYSICAL SCIENCE 2021, 2.

Date Published:

OCT 20

Abstract:

State-of-the-art p-i-n-based 3D perovskite solar cells (PSCs) use nickel oxide (NiOx) as an efficient hole transport layer (HTL), achieving efficiencies >22%. However, translating this to phase-pure 2D perovskites has been unsuccessful. Here, we report 2D phase-pure Ruddlesden-Popper BA2MA3Pb4I13 perovskites with 17.3% efficiency enabled by doping the NiOx with Li. Our results show that progressively increasing the doping concentration transforms the photoresistor behavior to a typical diode curve, with an increase in the average efficiency from 2.53% to 16.03% with a high open-circuit voltage of 1.22 V. Analysis reveals that Li doping of NiOx significantly improves the morphology, crystallinity, and orientation of 2D perovskite films and also affords a superior band alignment, facilitating efficient charge extraction. Finally, we demonstrate that 2D PSCs with Li-doped NiOx exhibit excellent photostability, with T99 = 400 h at 1 sun and T90 of 100 h at 5 suns measured at relative humidity of 60% ± 5% without the need for external thermal management.


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Last updated on 12/02/2021