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by Lijian Zuo, Hexia Guo, Dane W

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1 Polymer-modified halide perovskite films for efficient and stable planar heterojunction solar cells
by Lijian Zuo, Hexia Guo, Dane W. deQuilettes, Sarthak Jariwala, Nicholas De Marco, Shiqi Dong, Ryan DeBlock, David S. Ginger, Bruce Dunn, Mingkui Wang, and Yang Yang Science Volume 3(8):e August 23, 2017 Copyright © 2017 The Authors, some rights reserved; exclusive licensee American Association for the Advancement of Science. No claim to original U.S. Government Works. Distributed under a Creative Commons Attribution NonCommercial License 4.0 (CC BY-NC).

2 Fig. 1 Polymer-passivated perovskite films.
Polymer-passivated perovskite films. (A) Chemical structures of b-PEI, PAA, and PVP. (B) Schematic diagram for incorporating the polymer into the perovskite films. SEM images of (C) homogeneous PbI2 film without slow growth, (D) mesoporous PbI2 film with slow growth, and (E) perovskite film processed from slowly grown PbI2 with PVP polymer. (F) FTIR spectra of perovskite, PVP, and perovskite/PVP films. a.u., arbitrary units. (G) FTIR spectra of perovskite, PAA, and perovskite/PAA films. (H) GDOES measurement of perovskite and perovskite/PAA films. Lijian Zuo et al. Sci Adv 2017;3:e Copyright © 2017 The Authors, some rights reserved; exclusive licensee American Association for the Advancement of Science. No claim to original U.S. Government Works. Distributed under a Creative Commons Attribution NonCommercial License 4.0 (CC BY-NC).

3 Fig. 2 CH3NH3PbI3 solar cell devices with different polymer converted from microporous PbI2.
CH3NH3PbI3 solar cell devices with different polymer converted from microporous PbI2. (A) Schematic diagram of the device architecture. (B) Cross-sectional image of the solar cells. ITO, indium tin oxide. (C) I-V characteristics, (D) EQE spectra, (E) steady-state output power, and (F) shelf time of the solar cells with and without PVP treatment. Lijian Zuo et al. Sci Adv 2017;3:e Copyright © 2017 The Authors, some rights reserved; exclusive licensee American Association for the Advancement of Science. No claim to original U.S. Government Works. Distributed under a Creative Commons Attribution NonCommercial License 4.0 (CC BY-NC).

4 Fig. 3 Carrier dynamics. Carrier dynamics. (A) PL intensity spectra and (B) time-resolved PL (TRPL) decay spectra of perovskite films with different polymer incorporation. The fluence for the TRPL measurement is around 11 nJ/cm2, and the excitation density is around 1014 cm−3. Yellow line represents the fitted curve using the stretched exponential function. (C) TPV and (D) TPC of perovskite solar cells with different polymers. Lijian Zuo et al. Sci Adv 2017;3:e Copyright © 2017 The Authors, some rights reserved; exclusive licensee American Association for the Advancement of Science. No claim to original U.S. Government Works. Distributed under a Creative Commons Attribution NonCommercial License 4.0 (CC BY-NC).

5 Fig. 4 Electronic IS measurements.
Electronic IS measurements. Plots for (A) charge transfer resistance (R) and (B) the correlated capacitance (C), (C) lifetime (τ), and (D) DOS versus electron energy level in various devices. Lijian Zuo et al. Sci Adv 2017;3:e Copyright © 2017 The Authors, some rights reserved; exclusive licensee American Association for the Advancement of Science. No claim to original U.S. Government Works. Distributed under a Creative Commons Attribution NonCommercial License 4.0 (CC BY-NC).

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