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Fluorine-modification process and applications thereof

a technology of fluorine modification and fluorine, applied in the direction of thermoelectric devices, final product manufacture, basic electric elements, etc., can solve the problems of reducing the power conversion efficiency (pce), degrading the electrical performance of the device, and high degree of structural disorder

Inactive Publication Date: 2013-12-12
ACAD SINIC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

This patent aims to improve the power conversion efficiency and long-term stability of an organic solar cell (OSC) by reducing surface energy and improving the molecular orientation of the active layer in the device. To achieve this, a fluorine-containing layer is applied directly onto a hole transport layer to reduce surface energy, protect it from moisture-degradation, and recover it to its previous operable status. Additionally, a solar cell with a fluorine-containing layer exhibits a high open-circuit voltage (Voc) compared to conventional devices.

Problems solved by technology

The recombination of charge carriers can also hinder the separation process and hence reduce the power conversion efficiency (PCE).
The coexistence of the long-axis oriented dendrite-like domains (perpendicular to the substrate) and the fiber-like structures lying flat on the substrate leads to high degree of structural disorder.
Such structural disorder has been reported for degrading the electrical performances of devices, attributed to the trap states existed at the grain boundaries.
Moreover, the device lifetime is an important issue for OSC applications.
The degradation of device performance may be caused by the absorbed moisture during the manufacture and / or the operation of the OSC.
However, to operate the manufacture process in a glove box not only raises the manufacturing cost but also hinders mass production for commercialization of OSC.
In addition, configuring water absorbing agents may also result in additional manufacture cost.
To sum up, there are several factors / problems known to be important to the performance and commercialization of OSCs; however, those factors / problems still need to be clarified or solved.

Method used

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  • Fluorine-modification process and applications thereof
  • Fluorine-modification process and applications thereof
  • Fluorine-modification process and applications thereof

Examples

Experimental program
Comparison scheme
Effect test

example 1

Organic Solar Cell Preparation According to the Process of the Present Invention

Pentacene-Based OSC

[0065]All the chemicals were purchased from Aldrich. First of all, a glass substrate coated with indium tin oxide (ITO, the sheet resistance of 15 Ω, Aldrich) was prepared. The ITO-coated glass was then cleaned and ultrasonicated in a detergent solution followed by sonication in acetone and isopropyl alcohol. Then a PEDOT:PSS layer of about 30 nm was deposited on said ITO-coated glass by spin-coating (5000 rpm for 30 sec) in aqueous solution.

[0066]Various concentrations of PFAS was dissolved in chlorobenzene to obtain fluorine-containing liquids having 0.1, 0.3, 0.5, 0.7, or 0.9%(v / v) of PFAS. Those fluorine-containing liquids were respectively spin-coated (5000 rpm for 30 sec) to obtain a fluorine-containing layer on top of the PEDOT:PSS layer, and subsequently annealed at various temperatures in air atmosphere. The concentration of PFAS was displayed based on the total volume of chlo...

example 2

Characterization of the Pentacene-Based Organic Solar Cell of the Present Invention

Characterization of PEDOT:PSS Layer

[0070]In this example, we investigated the surface properties of an unmodified PEDOT:PSS layer (PEDOT:PSS) and a PFAS-modified PEDOT:PSS layer (PEDOT:PSS / PFAS; PFAS 0.5 v / v%) according to example 1. The surface energy was evaluated by measuring the contact angles using two test liquids: water and diiodomethane (CH2I2). The surface roughness (Rrms) was evaluated by atomic force microscopy (AFM). The results are showed in the following Table 1. The rsP and rsd are the polar and dispersion components of the surface energy, respectively. The (rsP+rsd) is the total surface energy. Rrms is the root-mean-square value of the surface roughness.

TABLE 1Contact angle, surface energy, and surface roughness of PEDOT:PSS andPEDOT:PSS / PFAS layersMethodsContact angleSurface energyAFMTermsCH2I2 (°)H2O (°)rsd (mJ / m2)rsp (mJ / m2)rsd + rspR r.m.s. (nm)PEDOT:PSS36.3234.7134.4627.9862.441.5...

example 3

Anti-Moisture Characteristics of the P3HT:PCBM-Based Organic Solar Cell of the Present Invention

[0090]In this example, the P3HT:PCBM based OSCs manufactured in the Example 1 were used to examine the anti-moisture characteristics provided by the fluorine-containing layer according to the present invention.

[0091]Four different OSC configurations were used in this example for examining the anti-moisture characteristics; that is: fresh PEDOT:PSS (Sample A); moisture-degraded PEDOT:PSS (Sample B); moisture-degraded PEDOT:PSS with 0.1%(v / v) PFDS (Sample C); and moisture-degraded PEDOT:PSS with 0.1%(v / v) PFN (Sample D). Sample A was used as a positive control and sample B was a negative control. The experimental results were showed in FIG. 8 and Table 4.

[0092]It is shown that sample B with degraded PEDOT:PSS shows S-shape J-V characteristics and the efficiency thereof dramatically decreases about one quarter, corresponding to the Voc from 0.63 to 0.45 V and Jsc from 9.79 to 7.90 mA / cm2. Wh...

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Abstract

The present invention is related to a process for reducing surface energy of a hole transport layer. The disclosed process comprises providing a hole transport layer; and providing a fluorine-containing layer directly on said hole transport layer. The configuration of said fluorine-containing layer reduces the structural disorder of an active layer and is able to recover a moisture-degraded hole transport layer, and thereby improves the performance of an electric device containing the same.

Description

FIELD OF THE INVENTION[0001]The present invention is related to the improvement of power conversion efficiency for an electronic device; more specifically to the improvement of power conversion efficiency for an organic solar cell.DESCRIPTION OF THE PRIOR ART[0002]Organic solar cells (OSC) have attracted much attention during the recent decades. Compared to the conventional photovoltaic devices, the organic solar cells have advantageous in low-cost fabrication and flexibility.[0003]In an organic solar cell, excitons are generated by photoexcitation of an organic solid. The active materials at OSC, in their corresponding donor / acceptor phases, provide the driving force for the exciton dissociation into charge carriers at the interfaces. The two phases must form bi-continuous networks for efficient excitons diffusion and charge separation. The recombination of charge carriers can also hinder the separation process and hence reduce the power conversion efficiency (PCE). Literatures hav...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): H01L51/48H01L51/56H01L51/46H01L51/40H10K99/00
CPCH01L51/4246Y02E10/549Y02P70/50H10K30/50H10K30/20H10K30/85H10K30/86H10K30/80H10K30/211H10K85/60H10K85/113H10K85/151H10K85/211H10K85/215H10K85/623
Inventor CHEN, KUEI-HSIENHAN, HSIEH-CHENGCHANG, CHING-CHUNCHEN, LI-CHYONGDU, CHAN-YI
Owner ACAD SINIC