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Title: High Performance Inverted Organic Photovoltaics Without Hole Selective Contact
Authors: Savva, Achilleas 
Burgués-Ceballos, Ignasi 
Papazoglou, Giannis 
Choulis, Stelios A. 
Kalli, Kyriacos 
Keywords: Bare silver electrodes;Carrier-selective contacts;Electrodes;Hole selectivity;Hole-transport-layer-free OPVs;Inverted organic photovoltaics;Photocurrent mapping
Category: Mechanical Engineering
Field: Engineering and Technology
Issue Date: 11-Nov-2015
Publisher: American Chemical Society
Source: ACS Applied Materials and Interfaces, 2015, vol. 7, no. 44, pp. 24608-24615
DOI: 10.1021/acsami.5b06578
Journal: ACS Applied Materials and Interfaces 
Abstract: A detailed investigation of the functionality of inverted organic photovoltaics (OPVs) using bare Ag contacts as top electrode is presented. The inverted OPVs without hole transporting layer (HTL) exhibit a significant gain in hole carrier selectivity and power conversion efficiency (PCE) after exposure in ambient conditions. Inverted OPVs comprised of ITO/ZnO/poly(3-hexylthiophene-2,5-diyl):phenyl-C61-butyric acid methyl ester (P3HT:PCBM)/Ag demonstrate over 3.5% power conversion efficiency only if the devices are exposed in air for over 4 days. As concluded through a series of measurements, the oxygen presence is essential to obtain fully operational solar cell devices without HTL. Moreover, accelerated stability tests under damp heat conditions (RH=85% and T=65oC) performed to non-encapsulated OPVs demonstrate that HTL-free inverted OPVs exhibit comparable stability to the reference inverted OPVs. Importantly, it is shown that bare Ag top electrodes can be efficiently used in inverted OPVs using various high performance polymer:fullerene bulk heterojunction material systems demonstrating 6.5% power conversion efficiencies.
ISSN: 1944-8244
DOI: 10.1021/acsami.5b06578
Rights: © 2015 American Chemical Society
Attribution-NonCommercial-ShareAlike 3.0 United States
Type: Article
Appears in Collections:Άρθρα/Articles

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