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IRG3: Chemical Doping of Organic Molecular Films for Photovoltaic Applications

IRG3: Chemical Doping of Organic Molecular Films for Photovoltaic Applications Richard A. Register, Princeton University, DMR 0213706. 2. 1. 0. -4. -2. 0. 2. 8. 4. 6. -1. Current Density [mA/cm 2 ]. -2. -3. Annealed n-C 60. Doped C 60. Undoped. -4. -5. Applied Bias [V].

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IRG3: Chemical Doping of Organic Molecular Films for Photovoltaic Applications

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  1. IRG3: Chemical Doping of Organic Molecular Films for Photovoltaic Applications Richard A. Register, Princeton University, DMR 0213706 2 1 0 -4 -2 0 2 8 4 6 -1 Current Density [mA/cm2] -2 -3 Annealed n-C60 Doped C60 Undoped -4 -5 Applied Bias [V] To advance the application of organic molecular films in solar cells, PCCM researchers have improved their conductivity and carrier injection by n-doping the acceptor layer in a donor-acceptor cell. The acceptor was a fullerene layer, C60, while the dopant was the low-ionization-energy molecule decamethylcobaltocene (CoCp2*). Simple ITO/CuPc/ C60:CoCp2*/Ag devices were constructed, and exhibited increased short-circuit currents (Jsc), open-circuit voltages (Voc), and fill factors (FF), and doubled power conversion efficiency compared with analogous undoped devices. These very significant improvements reflect increased film conductivity, resulting in decreased series resistance as well as changes in electric-field distribution and built-in voltage of the device that assist in carrier extraction. Supported by the MRSEC. Reference: C.K. Chan, W. Zhao, S. Barlow, S.R. Marder, and A. Kahn, “Decamethylcobaltocene as an efficient n-dopant in organic electronic materials and devices”, Org. Electron., 9, 575 -581(2008). J-V curves for the illuminated ITO/CuPc/ C60:CoCp2*/Ag cell. Black curve: undoped C60; Blue and red curves: doped C60 before and after annealing. The fill factor for the red curve is 0.60.

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