Details

Autor(en) / Beteiligte

• Stanojević, Milan
• Gojanović, Jovana
• Živanović, Sandra

Titel

A cluster of bilayer diodes model for bulk heterojunction organic solar cells

Ist Teil von

• Optical and quantum electronics, 2023-06, Vol.55 (6), Article 508

Ort / Verlag

New York: Springer US

Erscheinungsjahr

2023

Quelle

Springer Nature

Beschreibungen/Notizen

• To estimate the value of the ideality factor n and the order of reverse saturation current J 0 in the bulkheterojunction (BHJ) P3HT:PCBM based organic solar cells (OSCs), a multitude of experimentally determined light and dark current density–voltage ( J – V ) curves from literature were fitted with the ideal single diode model and the obtained results were statistically analyzed. The J – V curves of devices with similar structures, dimensions, fabrication parameters, and operation conditions were considered. The same was done for the bilayer (BL) P3HT/PCBM OSCs. Approximately the same parameter values were obtained for both the BHJ and BL OSC devices under illumination ( n L ∈ [ 3 , 4 ] and J 0 L ∈ 0.1 , 0.01 mA / cm 2 ). The gathered dark J – V curves were fitted by using the Shockley equation and statistically analyzed. Interestingly, for the dark J – V curves, n D ∈ [ 2 , 3 ] and J 0 D ∈ 0.01 , 0.001 mA / cm 2 were obtained. The difference between the n values and the order of J 0 under the light and in the dark was discussed and explained by a limited transport in the OSCs active layer and the contribution of photogenerated carriers to the recombination current. The same J – V parameters obtained for both BHJ and BL devices indicate the same underlying physics in both types of OSCs. By modeling the photogeneration and recombination processes at the D/A interfaces and considering the orientation of the D/A domains with respect to the vector of the resulting electric field in the devices, the short circuit current and J 0 L were calculated and compared to the experimental data, and a very good agreement was achieved.