Title:	Homogeneous and Efficient Co-Evaporated MoO3:CuI Anode Buffer Layer for Organic Solar Cells
Author(s):	M. Hssein, L. Barkat, L. Cattin, G. Louarn, M. Addou, A. Khelil, J.C. Bernède
Keywords:	Buffer Layer, Organic Solar Cell, CuI, MoO3, CuPc
Topic:	Thin Film Solar Cells and Modules
Subtopic:	Perovskite, Organic and Hybrid devices
Event:	32nd European Photovoltaic Solar Energy Conference and Exhibition
Session:	3DV.2.38
Pages:	1328 - 1331
ISBN:	3-936338-41-8
Paper DOI:	10.4229/EUPVSEC20162016-3DV.2.38
Price:	0,00 EUR
Document(s):	paper, poster

Abstract/Summary:

---

One possibility to increase the power conversion efficiency (PCE) of the organic photovoltaic cells (OPVCs) is to introduce a thin anode buffer layer (ABL) between the anode and the organic electron donor (ED). Among the possible ABLs, it was shown that CuI is very efficient. However, it was shown that the morphology of the CuI layers depends strongly on the film deposition conditions, mainly on the deposition rate. The surface roughness of the CuI layer is often very high if we do not control precisely the conditions of deposition of the layer. This high surface roughness introduces leakage current paths in the devices and therefore poor performances reproducibility. Therefore, in the present work, we proceed to co-evaporation of an hybrid ABL MoO3/CuI. The co-evaporation process avoids CuI crystallization which prevents rough ABL formation, even for a deposition rate of 0.01 nm/s for each compound. These MoO3/CuI ABL were probed in planar heterojunction OPVCs based on the couple copper phthalocyanine/fullerene(CuPc/C60). By comparison with OPVCs using reference ABL (MoO3, CuI or MoO3/CuI) there is a systematic improvement of their PCE and this for a deposition rate 2 times higher than in the case where CuI is deposited alone.