Spatial redistribution of the optical field intensity in inverted polymer solar cells

Abstract

We have used indium tin oxide (ITO), a transparent conducting oxide, as an optical spacer to improve the performance of inverted polymer solar cells. The optical interference effect resulted in spatial redistribution of the optical field in the devices. Although the degree of light absorption in inverted cells was not increased, the resulting favorable distribution of photogenerated excitons probably decreased the level of exciton quenching near the electrodes. As a result, the introduction of the ITO optical spacer at an appropriate thickness increased the short-circuit current density and the overall power conversion efficiency.

Analyzing local exciton generation profiles as a means to extract transport lengths in organic solar cells

“…10,17,18 Optical modeling is based on the transfer/scattering matrix method 19 and is checked against a commercial software package ͑DIF-FRACTMOD from RSoft Design Group͒. Optical properties of each material layer are determined via spectroscopic ellipsometry, 14 which closely match reported values.…”

Combination of Indene-C60 Bis-Adduct and Cross-Linked Fullerene Interlayer Leading to Highly Efficient Inverted Polymer Solar Cells

“…Extensive efforts to improve the efficiency of inverted PSCs by modifying the interface include inserting Cs 2 CO 3 to reduce the ITO work function, 4 using metal oxides such as TiO x and ZnO to function as electron-selecting layers, modifying the TiO x or ZnO surface with a self-assembled C 60 monolayer, 6 using MoO 3 as the hole-extracting buffer, 7 and employing an optical spacer to redistribute the optical field intensity. 8 However, PCEs of P3HT/PCBM-based inverted PSCs are mostly in the range of ca. 2-4%, which is inferior to that of conventional PSCs.…”

Immunosensor Characterization Using Impedance Spectroscopy

“…The obvious high frequency capacitance deviation among Sensor 1, Sensor 2 and Glutaraldehyde layer results was due to the concentration of AuNPs are different, which determined the different responses of the sensors in the high frequency range; the higher the AuNPs concentration, the lower the capacitance will be detected. The frequency turning points in the capacitance versus frequency plot can be used to correlate the AuNPs concentration [19][20][21]. Both Sensor 2 and Sensor 3 have congruous impedance profile with the curve done on the surface of glutaraldehyde, while the impedance is much lower.…”