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Issue 19, 2015
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Hierarchical i–p and i–n porous heterojunction in planar perovskite solar cells

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Abstract

A hierarchical pore network in planar CH3NH3PbI3 perovskite is demonstrated herein. Quantitative characterizations by grazing incidence small angle X-ray scattering (GISAXS) with modeling and complementary microscopic observations provide insight at various length scales. It is a pore structure comprised of nano-scaled primary pores aggregating into meso-scaled fractal networks within the perovskite layer. Its structural evolution and mechanistic interpretation are explored with respect to different preparation methods/steps. The time-of-flight secondary ion mass spectrometer (TOF-SIMS) results suggest the infiltration of hole transporting materials (HTM) or electron transporting materials (ETM) deposited on top at different length scales. The inter-penetrating perovskite/HTM or perovskite/ETM form i–p or i–n one-sided porous heterojunctions, respectively, over the typically regarded planar-stacked heterojunction. They show distinctive photovoltaic characteristics and behaviors in which the large i–n interfaces at the nanoscale lead to highly efficient, hysteresis-free and reliable solar cell devices. The morphology–performance correlation is helpful for associated design of device architecture and processing toward higher efficiency and stability.

Graphical abstract: Hierarchical i–p and i–n porous heterojunction in planar perovskite solar cells

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Publication details

The article was received on 25 Mar 2015, accepted on 02 Apr 2015 and first published on 02 Apr 2015


Article type: Paper
DOI: 10.1039/C5TA02184G
Author version available: Download Author version (PDF)
Citation: J. Mater. Chem. A, 2015,3, 10526-10535
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    Hierarchical i–p and i–n porous heterojunction in planar perovskite solar cells

    H. Liao, C. Tsao, M. Jao, J. Shyue, C. Hsu, Y. Huang, K. Tian, C. Chen, C. Su and W. Su, J. Mater. Chem. A, 2015, 3, 10526
    DOI: 10.1039/C5TA02184G

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