Jump to main content
Jump to site search


Iodine-doped ZnO Nanopillar Arrays for Perovskite Solar Cells with High-Efficiency up to 18.24%

Abstract

Fabricating an 1D electron transport layer (ETL) with bi-functionalities capable of effectively extracting electrons from a fully-covered perovskite layer and synergistically blocking charge recombination between electrons in the cathode and holes in the perovskite is of great importance for high performance perovskite solar cells (PSCs). Herein, we report a compact and even ZnO:I nanopillar planar ETL that enables deposition of a fully covering and highly uniform perovskite layer by a facile one-step spin-coating process method. We find that the crystal growth of 1D ZnO along the [0001] direction of a hexagonal singe crystal is largely suppressed owing to iodine doping, which leads to a low-aspect-ratio and dense 1D nanopillar alligned architecture, and thus promotes one-step deposition of perovskite layer. As characterized by optical spectra, Kelvin probe force microscopy, and electrochemical assays, the resultant ZnO:I nanopillar ETL film exhibits high optical transparency, reduced work function and superior electron extraction ability. As a result, the opt-electrical conversion efficiency is promoted to as high as 18.24%, exceeding the previous highest efficiency recorded for 1D ETL based CH3NH3PbI3 PSCs. The enhanced performance is discussed in detail based on a well-matched work function between ZnO:I and perovskite, fast electron extraction from perovskite into ZnO:I ETL, and improved electron transport rate and retarded charge recombination at the 1D ZnO:I ETL/perovskite interface. This work provides a novel and efficient 1D ETL via alien element doping and crystal oriented growth control for maximizing PSC performance.

Back to tab navigation
Please wait while Download options loads

Supplementary files

Publication details

The article was received on 11 Apr 2017, accepted on 13 May 2017 and first published on 15 May 2017


Article type: Paper
DOI: 10.1039/C7TA03150E
Citation: J. Mater. Chem. A, 2017, Accepted Manuscript
  •   Request permissions

    Iodine-doped ZnO Nanopillar Arrays for Perovskite Solar Cells with High-Efficiency up to 18.24%

    Y. Zheng, E. Zhao, F. Meng, X. Lai, X. Dong, J. Wu and X. Tao, J. Mater. Chem. A, 2017, Accepted Manuscript , DOI: 10.1039/C7TA03150E

Search articles by author