Dependence of Device Characteristics of Bulk-Heterojunction Organic Thin-Film Solar Cells on Concentration of Glycerol and Sorbitol Addition in Pedot: PSS Solutions for Fabricating Buffer Layers

Abstract

We have investigated the dependence of device characteristics of bulk-heterojunction organic thin-film solar cells on the concentration of glycerol and sorbitol addition in poly(3,4-ethylenedioxy thiophene):poly(4-styrene sulfonate) (PEDOT:PSS) solutions for fabricating buffer layers. The device structure is ITO/buffer/regioregular poly(3-hexylthiophene) (P3HT):[6,6]-phenyl C 61-butyric acid methylester (PCBM)/ Al . Glycerol addition is effective for increasing power conversion efficiency (PCE) from 1.25 to 1.41% because of the increase in short-circuit current density (J sc ) without decreasing open-circuit voltage (V oc ). On the other hand, sorbitol addition decreases PCE from 1.25 to 1.04%, owing to the decrease in V oc . This difference in V oc behavior is ascribed to different work function of PEDOT:PSS with glycerol and sorbitol treatment.

Charge Accumulation in Organic Solar Cells during Device Operation as Investigated by Electron Spin Resonance

“…Organic thin-film solar cells attract much attention as an alternative source of electrical energy because of their printability, flexibility, light weight, and possibility of lowcost production. [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18] There has been a significant amount of interest in the high power conversion efficiency (PCE) of 10%. 14,15) The durability of solar cells is another important problem for the practical use of solar cells.…”

Development of Environmentally Controlled Desktop Spray Coater and Optimization of Deposition Conditions for Organic Thin-film Photovoltaic Cells

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Enhanced photovoltaic performance of planar perovskite solar cells fabricated in ambient air by solvent annealing treatment method

“…Thin-film solar cells such as dye-sensitized solar cells [1][2][3][4][5][6] and organic photovoltaics [7][8][9][10][11] have been studied extensively because they can be assembled using low-cost materials and manufactured by cost-effective methods, which are considered to be very promising renewable energy technologies. In recent years, organic-inorganic hybrid methylammonium lead halide perovskite (e.g., MAPbX 3 , X = Cl, Br, I) materials have shown to be efficient light-absorbing layers owing to their perfect intrinsic properties for photovoltaic (PV) applications, such as a high absorption coefficient, 12) a low exciton binding energy (∼50 meV), 13) an appropriate band gap (∼1.55 eV), 14) and a large hole-electron diffusion length.…”