Preparation method of flexible substrate silicon nanowire heterojunction solar cell

Abstract

The invention relates to solar cells, in particular to a preparation method of a flexible substrate silicon nanowire heterojunction solar cell. Excellent light absorbing characteristics of silicon nanowires are brought into full play. The preparation method includes utilizing a wet etching process to prepare a monocrystalline silicon nanowire array on a monocrystalline silicon substrate, adopting a copper electroconductive adhesive tape to transfer silicon nanowires on copper foil, and preparing a silicon nanowire cell. Being different from a method that a silicon nanowire array on a monocrystalline silicon substrate is directly utilized to prepare a cell, the preparation method sequentially includes the steps of transferring the silicon nanowires on a flexible substrate and preparing the silicon nanowire cell, so that the monocrystalline silicon substrate can be repeatedly used, silicon consumption is reduced, and material cost is saved.

Description

technical field

[0001] The invention relates to a solar cell, in particular to transferring a silicon nanowire array to a metal foil to prepare a nanowire heterojunction solar cell. Background technique

[0002] Due to its optical properties of antireflection and strong absorption and electrical properties of high carrier mobility, silicon nanowire structure has become a strong candidate for photovoltaic materials; researchers at Harvard University have obtained a single p-i-n radial Silicon nanowire cells, the conversion efficiency reached 3.4% [Tian B Z et a1. Coaxial silicon nanowires as solar cells and nanoelectronie power sources. nature, 2007, 449(7164): 885-890]; the introduction of the radial structure makes the light absorption and photogenerated carrier transport direction orthogonal, thus solving the contradiction between light absorption and photogenerated carrier separation, but This method utilizes the micromachining technology of a single nanowire operation,...

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