Natrium Doping Pushes the Efficiency of Carbon-Based CsPbI3 Perovskite Solar Cells to 10.7% Sisi Xiang, Weiping Li, Ya Wei, Jiaming Liu, Huicong Liu,

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Natrium Doping Pushes the Efficiency of Carbon-Based CsPbI3 Perovskite Solar Cells to 10.7% Sisi Xiang, Weiping Li, Ya Wei, Jiaming Liu, Huicong Liu, Liqun Zhu, Shihe Yang, Haining Chen iScience Volume 15, Pages 156-164 (May 2019) DOI: 10.1016/j.isci.2019.04.025 Copyright © 2019 The Author(s) Terms and Conditions

iScience 2019 15, 156-164DOI: (10.1016/j.isci.2019.04.025) Copyright © 2019 The Author(s) Terms and Conditions

Figure 1 Composition Characterizations of Cs1-xNaxPbI3 (0 ≤ x ≤ 0.1) Perovskite Films (A) XRD patterns. (B) Magnification of the (100) peak to show the peak shifts in the Na-doped film. (C) Secondary ion mass spectroscopy depth profile for Cs, Pb, I, and Na elements of CsPbI3 and Cs0.95Na0.05PbI3 films. (D) High-resolution XPS spectra of CsPbI3 and Cs0.95Na0.05PbI3 films. iScience 2019 15, 156-164DOI: (10.1016/j.isci.2019.04.025) Copyright © 2019 The Author(s) Terms and Conditions

Figure 2 Device Structure and Photovoltaic Performance of CsPbI3 and Cs1-xNaxPbI3 (0 ≤ x ≤ 0.1) C-PSCs (A) Scheme and cross-sectional SEM image of CsPbI3 C-PSCs. (B–E) Statistical box chart of (B) Voc, (C) Jsc, (D) FF, and (E) PCE of CsPbI3 and Na-doped CsPbI3 C-PSCs. iScience 2019 15, 156-164DOI: (10.1016/j.isci.2019.04.025) Copyright © 2019 The Author(s) Terms and Conditions

Figure 3 Champion Photovoltaic Performance of CsPbI3 and Cs0.95Na0.05PbI3 C-PSCs (A–D) (A) J-V curves, (B) stabilized power output, (C) IPCE spectra and integrated Jsc, and (D) stability results of CsPbI3 and Cs0.95Na0.05PbI3 C-PSCs that were stored in dry air atmosphere (20°C –35°C and 10%–20% humidity). All devices used for the performance and stability testing were non-encapsulated. iScience 2019 15, 156-164DOI: (10.1016/j.isci.2019.04.025) Copyright © 2019 The Author(s) Terms and Conditions

Figure 4 Morphology and Optoelectronic Properties of CsPbI3 and Cs0.95Na0.05PbI3 Films (A and B) Top-view SEM images of (A) CsPbI3 and (B) Cs0.95Na0.05PbI3 films. (C–F) (C) Absorption coefficient (α) versus wavelength curves and (D) TRPL of CsPbI3 and Cs0.95Na0.05PbI3 films. Fluorescence lifetime mapping images of (E) CsPbI3 and (F) Cs0.95Na0.05PbI3 films. iScience 2019 15, 156-164DOI: (10.1016/j.isci.2019.04.025) Copyright © 2019 The Author(s) Terms and Conditions

Figure 5 Junction Properties and Carrier Behaviors in C-PSCs (A–C) (A) Mott-Schottky analysis at 10 kHz for CsPbI3 and Cs0.95Na0.05PbI3 C-PSCs. UV photoelectron spectroscopy of CsPbI3 and Cs0.95Na0.05PbI3 films: (B) cutoff region and (C) valence band edge region. (D–F) (D) Energy level diagrams of CsPbI3 and Cs0.95Na0.05PbI3 C-PSCs, which were obtained from the UV photoemission spectroscopy results. Energy level diagram of the (E) CsPbI3/carbon and (F) Cs0.95Na0.05PbI3/carbon interfaces. EVBM represents the energy level of valence band maximum, ECBM represents the energy level of conduction band minimum, and Ef represents the Fermi level. iScience 2019 15, 156-164DOI: (10.1016/j.isci.2019.04.025) Copyright © 2019 The Author(s) Terms and Conditions