Terbium-Doped and Dual-Passivated γ-CsPb(I1- x Brx )3 Inorganic Perovskite Solar Cells with Improved Air Thermal Stability and High Efficiency

Sawanta S Mali; Jyoti V Patil; Sachin R Rondiya; Nelson Y Dzade; Julian A Steele; Mohammad Khaja Nazeeruddin; Pramod S Patil; Chang Kook Hong

doi:10.1002/adma.202203204

Terbium-Doped and Dual-Passivated γ-CsPb(I_1- _x Br_x )₃ Inorganic Perovskite Solar Cells with Improved Air Thermal Stability and High Efficiency

Adv Mater. 2022 Jul;34(29):e2203204. doi: 10.1002/adma.202203204. Epub 2022 Jun 9.

Authors

Sawanta S Mali¹, Jyoti V Patil^{1

2}, Sachin R Rondiya^{3

4}, Nelson Y Dzade^{3

5}, Julian A Steele⁶, Mohammad Khaja Nazeeruddin⁷, Pramod S Patil⁸, Chang Kook Hong¹

Affiliations

¹ Polymer Energy Materials Laboratory, School of Chemical Engineering, Chonnam National University, Gwangju-S, Jeollanam-do, 61186, Korea.
² Optoelectronic Convergence Research Center, Chonnam National University, Gwangju, Jeollanam-do, 61186, Korea.
³ School of Chemistry, Cardiff University, Main Building, Park Place, Cardiff, Wales, CF10 3AT, UK.
⁴ Department of Materials, Imperial College London, Exhibition Road, London, SW7 2AZ, UK.
⁵ Department of Energy and Mineral Engineering, Pennsylvania State University, University Park, PA, 16802, USA.
⁶ cMACS, Department of Microbial and Molecular Systems, KU Leuven, Leuven, 3001, Belgium.
⁷ Group for Molecular Engineering of Functional Materials, Institute of Chemical Sciences and Engineering, EPFL VALAIS, Sion, 1951, Switzerland.
⁸ Thin Film Materials Laboratory, Department of Physics, Shivaji University, Kolhapur, Maharashtra, 416004, India.

PMID: 35581144
DOI: 10.1002/adma.202203204

Abstract

Realizing photoactive and thermodynamically stable all-inorganic perovskite solar cells (PSCs) remains a challenging task within halide perovskite photovoltaic (PV) research. Here, a dual strategy for realizing efficient inorganic mixed halide perovskite PV devices based on a terbium-doped solar absorber, that is, CsPb_1- _x Tb_x I₂ Br, is reported, which undertakes a bulk and surface passivation treatment in the form of CsPb_1- _x Tb_x I₂ Br quantum dots, to maintain a photoactive γ-phase under ambient conditions and with significantly improved operational stability. Devices fabricated from these air-processed perovskite thin films exhibit an air-stable power conversion efficiency (PCE) that reaches 17.51% (small-area devices) with negligible hysteresis and maintains >90% of the initial efficiency when operating for 600 h under harsh environmental conditions, stemming from the combined effects of the dual-protection strategy. This approach is further examined within large-area PSC modules (19.8 cm² active area) to realize 10.94% PCE and >30 days ambient stability, as well as within low-bandgap γ-CsPb_0.95 Tb_0.05 I_2.5 Br_0.5 (E_g = 1.73 eV) materials, yielding 19.01% (18.43% certified) PCE.

Keywords: all-inorganic perovskites; dual passivation; high efficiency devices; perovskite solar cell modules; phase stability.

Abstract

Grants and funding