Issue 18, 2019

Overcoming intrinsic defects of the hole transport layer with optimized carbon nanorods for perovskite solar cells

Abstract

To overcome the intrinsic chemical-reduction-activity of highly p-doped PEDOT:PSS and improve the open-circuit voltage (Voc) of planar inverted perovskite solar cells, a kind of oxidized carbon nanorods (OCNRs) is developed by a ball-milling/chemical-oxidation method and incorporated into PEDOT:PSS hole transport layer (HTL). The incorporation of OCNRs can increase the work function of the PEDOT:PSS layer, which avoids the energy-level mismatch between the PEDOT:PSS HTL and the HOMO level of the CH3NH3PbI3 perovskite layer, leading to a relatively high Voc of 1.01 V (vs. 0.92 V for the PEDOT:PSS device). Moreover, the introduction of OCNRs into the PEDOT:PSS HTL increases the grain size and uniformity of the perovskite layer, accompanied by the improved charge transport ability. As a result, the fill factor of perovskite solar cells is increased from 75.4% to 81.7%, and the best power conversion efficiency of 19.02% is achieved.

Graphical abstract: Overcoming intrinsic defects of the hole transport layer with optimized carbon nanorods for perovskite solar cells

Supplementary files

Article information

Article type
Paper
Submitted
01 Mar 2019
Accepted
08 Apr 2019
First published
09 Apr 2019

Nanoscale, 2019,11, 8776-8784

Overcoming intrinsic defects of the hole transport layer with optimized carbon nanorods for perovskite solar cells

Z. Li, J. Dong, W. Han, G. Ren, C. Liu, H. Cui, L. Shen and W. Guo, Nanoscale, 2019, 11, 8776 DOI: 10.1039/C9NR01836K

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