Spray deposited MoO3 layer used in organic bulk-heterojunction solar cells

Neha Chaturvedi^a, Sanjay Kumar Swami^a, Viresh Dutta^a

^aCES, IIT Delhi, Centre for Energy Studies, Block 5, New Delhi, 110016

International Conference on Hybrid and Organic Photovoltaics
Proceedings of International Conference on Hybrid and Organic Photovoltaics 2015 (HOPV15)

Roma, Italy, 2015 May 11th - 13th

Organizer: Filippo De Angelis

Poster, Viresh Dutta, 414
Publication date: 5th February 2015

Polymer solar cells have attracted considerable attention as a renewable energy source from the last few years due to its versatile potential for the fabrication of large area, flexible, roll to roll portability and simple lightweight structure [1]. A significant improvement in the power conversion efficiency (PCE) of polymer solar cell was reported with a value of ~ 10%. However, the limited lifetime of conventional organic solar cell is still a big challenge for the commercialization. The choice of effective interfacial layer with good energy alignment is an effective way to improve the performance of organic solar cell. Among all transition metal oxides molybdenum trioxide (MoO₃) is one of the most interesting material due to its good stability, higher transmittance, high work function and non-toxicity. MoO₃ as a HTL reduces the charge recombination and resistance at the interface of photoactive layer and anode [2]. Spray process is used for the deposition of MoO₃ hole transport layer. The orthorhombic phase of MoO₃ (α-MoO₃) is achieved by spray deposition without any impurity. The process results in the formation of nanostructured MoO₃ layer with high transmittance. Raman results show the orthorhombic phase of MoO₃ layer. Organic bulk-hetero-junction solar cell is fabricated using spray deposited MoO₃ layer as HTL and P3HT:PCBM as an active layer.
SEM image of spray deposited MoO3 layer
[1] Park, S. H; Roy, A; Beaupre, S; Cho, S; Coates, N; Moon, J.S; Moses, D; Leclerc, M; Lee, K; Heeger. A. J. Bulk Heterojunction Solar Cells with Internal Quantum Efficiency Approaching 100%. Nature Photonics, 2009, 3, 297–302. [2] Zhao, D. W.; Tan, S. T.; Ke, L; Liu, P; Kyaw, K. K.; Sun, X. W.; Lo, G. Q.; Kwong, D. L. Optimization of An Inverted Organic Solar cell, Sol. Energy Mater. Sol. Cells, 2010, 94, 985–991.

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