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Encapsulation of photovoltaic cells

A photovoltaic cell and organic-based technology, applied in photovoltaic power generation, circuits, electrical components, etc., can solve the problems of low market share and high initial cost of photovoltaic cell arrays, achieve simple methods, increase output and optical efficiency, and improve cell efficiency Effect

Inactive Publication Date: 2009-09-30
DOW CORNING CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The use of photovoltaic cells to generate electricity still has only a relatively low market share, at least in part due to the high initial cost of photovoltaic arrays

Method used

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  • Encapsulation of photovoltaic cells
  • Encapsulation of photovoltaic cells
  • Encapsulation of photovoltaic cells

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

Example 1: Preparation of Resin / Polymer Blends

[0121] In a ZSK bilobal twin-screw extruder, a trimethyl-terminated polydimethyl, methylvinylsiloxane compound with a plasticity of 58 mils measured according to ASTM926 was blended with 30 wt % A solution of a vinyl-functional MQ resin in xylene: M:Q resin has a M:Q ratio of about 0.75, a vinyl content of about 1.8 wt% and a number average molecular weight of 6000 g / mol. The trimethyl-terminated polydimethyl, methylvinylsiloxane compound is fed into the extruder using a single screw feeder, and the resin solution is introduced using a positive displacement feed pump at a temperature of about 150°C The initial mixing was carried out under 1 minute, and after a period of 1 minute, the temperature was increased to 180° C. to complete the mixing process, and to strip the xylenes, three vacuum stripping zones were used, each at a pressure of 29″Hg ( 98.2kNm -2 ), to achieve greater than 99% solvent removal. The resulting size / resi...

Embodiment 2

Example 2: Addition of Catalyst to Resin Size Blend

[0123] To introduce the catalyst package into the product of Example 1 above, 95.5 wt% of the product of Example 1 was mixed with 3 wt% of 1,1-bis(tert-peroxy Butyl)-3,3,5-trimethylcyclohexane and 1% by weight of a vinyl-functional crosslinker in the form of linear polydimethylsiloxane with a degree of polymerization of 100 and a vinyl content of 0.05% by weight and 0.5% acryloylpropyltrimethoxysilane functional adhesion promoter and preheated to 110 °C. The resulting product was extruded into a sheet using a flatbed press under a force of 300 kN to obtain a transparent film with a thickness of about 25 mil (0.635 mm). Silicone coated polyester is used as a release liner to prevent the product from sticking to the press.

Embodiment 3

[0124] In Example 3, 93.4 wt% pellets of the size / resin blend prepared as described in Example 1 were introduced into a Haake mixer equipped with a sigma-type paddle and preheated to 110°C. To this was added 6.13% by weight of methylhydrocyclosiloxane having an average ring size of 4.5 repeating units. After mixing, the resulting mixture was cooled to 70°C at about 110°C while continuing to mix. Finally 0.28 wt% diallyl maleate catalyst inhibitor and 0.19 wt% homogeneous Pt complex were introduced into the mixture. The resulting homogeneous mixture was extruded between 2 sheets of fluorine-coated PET to a thickness of 15 mil (0.381 mm) and cured under glass in a laminator at a set temperature of 150° C. within 7 minutes.

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Abstract

This invention relates to a photovoltaic cell module and a process of applying a silicone based hot melt encapsulant material (102a, 104a) onto photovoltaic cells (103a) to form a photovoltaic cell module. There is provided a photovoltaic array with more efficient manufacturing and better utilization of the solar spectrum by using silicone hot melt sheets (102a, 104a) to give a silicone encapsulant photovoltaic device with the process ease of an organic encapsulant but the optical and chemical advantages of a silicone encapsulant. There is further provided a method for fabricating photovoltaic cells with increased throughput and optical efficiency when compared to prior art encapsulation methods. The preferred silicone material is provided in flexible sheet with hot melt properties and low surface tack.

Description

[0001] This invention was made with government support from the Department of Energy under NREL Subcontract No. ZAX-5-33628-02, Original Contract No.: DE-AC36-98G010337. The government has certain rights in this invention. Pursuant to 35.U.S.C §119(e), this application claims the benefit of US Provisional Patent Application Serial No. 60 / 733684, filed November 4, 2005, which is hereby incorporated by reference. technical field [0002] The present invention relates to photovoltaic cell modules and methods of applying silicone-based encapsulant materials to photovoltaic cells to form photovoltaic cell modules. Background technique [0003] Solar or photovoltaic cells are semiconductor devices (hereinafter referred to as photovoltaic cells) used to convert light into electricity. Typically, upon exposure to light, a photovoltaic cell develops a voltage across its terminals, causing a sequenced flow of electrons proportional to the intensity of light impinging on the photovolt...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01L31/0216H01L31/048C09J183/14C08L83/14
CPCC08L83/14H01L31/18Y02E10/50H01L31/02167H01L31/048H01L31/0481C08L2666/44H01L31/042
Inventor R·A·德雷克J·D·I·C·哈比玛纳N·E·谢泼德M·穆罕默德B·M·凯托拉J·S·汤奇S·詹金斯S·阿尔图姆
Owner DOW CORNING CORP
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