A generalized electronic model for organic and inorganic material systems with free electrons, holes, singlet excitons, and triplet excitons as the energy carrying particles.
(a) Structure of the organic solar cell for a case study with a 100 nm layer of P3HT and a 100 nm of PCBM.
Band diagram of the device under short (a) and open (b) circuit conditions both simulated under AM1.5 illumination where light is illuminated from left side. Density of electron (red), holes (green), and excitons (blue) in the device under short (c) and open (d) circuit conditions.
IV characteristics of the bilayer organic solar cell considering (a) different flux of dissociated excitons (J Xd in cm−2/s), (b) different values of mobility. (Electron and hole mobility values in both donor and acceptor material scaled by the same factors of 1/3, 3, 10, 30, and 100), (c) different energy barriers at the top contact (difference between HOMO level of donor and work function of the front contact). The simulation was conducted under AM1.5 spectrum and ohmic back contact.
(a) Effect of direct recombination coefficient in the bulk of both acceptor and donor media on the IV characteristics of the bilayer organic solar cell. (b) Recombination rate as a function of β throughout the bilayer organic solar cell under open circuit condition. The x-axis, in log-scale, shows the distance from the donor/acceptor interface.
Sensitivity analysis conducted on the performance characteristics of the bilayer solar cell versus important material and device parameters. represents sensitivity of parameter W versus parameter U and is calculated by .
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