Porous silicon as an intermediate layer for thin-film solar cell

The potential of porous silicon (PS) with dual porosity structure as an intermediate layer for ultra-thin film solar cells is described. It is shown that a double-layered PS with a porosity of % allows to grow epitaxial Si film at medium temperature (725°–800°C) and at the same time serves as a gettering/diffusion barrier for impurities from potentially contaminated low-cost substrate. A 3.5 μm thin-film cell with reasonable efficiency is realized using such a PS intermediate layer.     

节能型生态住宅冬季供暖系统性能的数值模拟

针对利用太阳能、地下水的一种节能型生态住宅低温地板辐射供暖系统提出了相应的数学模型，并进行了模拟分析，通过对一个测试房间的房间温度和能耗分析，表明太阳能、地热能作为可再生能源，利用于生态住宅供暖系统，具有明显的经济效益、节能效益和环境效益，有较高的推广价值。     

西藏自治区民用建筑采暖设计地方标准简介

标准结合西藏的能源供应模式和生态特点,提出通过主、被动式太阳能利用和建筑保温方法解决当地的采暖问题,主动式供暖系统以太阳能热水为主要热源;标准涉及供暖室内外计算参数的确定、热负荷计算、太阳能热水系统设计等方面,为当地民用建筑供暖制定了设计依据.     

复合式能源系统在建筑节能方面的应用效果

以某酒店工程的能源系统为例,通过复合式可再生能源供给,满足酒店运行所需的能源。其中,电力源由地面光伏发电、光伏建筑一体化发电、风光互补发电、市政供电及自备发电机组成;冷热源由高温地热水、太阳能集热、水源热泵及常规锅炉组成。通过酒店智能化弱电系统调配各种能源形式,形成先后利用关系,尽量优先利用免费的可再生能源,减少化石能源的利用,最大限度地降低酒店能耗,使该酒店成为实际意义上的节能低碳建筑。     

太阳能、空气源热泵热水系统性能优化实验研究

将已实用化的非直膨式太阳能、空气源热泵热水器作为被测对象,测试其基础性能,以对其全年实际性能进行分析。然后设计拟定出3种性能优化方案,对提出方案进行可行性分析并在冬季条件下进行多组实验,以观测所能达到的优化程度。最后提出一种优化方案的综合运行策略,并通过模拟全年不同温度、气候环境计算出该优化方案的综合运行效果,复合系统全年累计电能消耗减少达45.8%。     

基于ZigBee的太阳能集热器无线跟踪系统

为解决太阳能集热器吸收热能效率低、布线难度大及管理不便等问题,将ZigBee无线通信技术应用到太阳能集热器跟踪系统中.开展了太阳能集热器热能吸收效率研究,建立了太阳位置和当地地理位置之间的关系,研制了精确跟踪太阳位置的集热器无线控制系统;采用了Cortex_M3架构的32位处理器STM32W108,在处理器内部集成了ZigBee无线通信部分;通过全球定位系统(GPS)获取了当地地理位置和本地时间计算太阳位置;采用了C#上位机软件监控和管理无线系统.测试结果表明:该系统能精确跟踪太阳,提高集热器吸热效率;并具有组网方便、布线少、数据传输可靠等特点.     

Gettering by heat thermal processing: application in crystalline silicon solar cells

The aim of this work is to getter unwanted impurities from solar grade crystalline silicon (Si) wafers and then to enhance their electronic properties. This was done by forming a sacrificial porous silicon (PS) layer on both sides of the Si wafers and by performing infrared (IR) thermal annealing treatments (at around 950 °C) in a SiCl₄/N₂ controlled atmosphere. The process allows concentrating unwanted impurities in the PS layer and near the PS/silicon interface. These treatments reduce the resistivity by about two orders of magnitude at a depth of about 40 μm and improve the minority carrier diffusion length from 75 to 210 μm. This gettering method was also tested on silicon wafers where grooved fingers and back contacts were achieved using a chemical vapor etching (CVE) method. Front buried metallic contacts and small holes for local back surface field were then achieved after the gettering stage in order to realize silicon solar cells. It was shown that the photovoltaic parameters of gettered silicon solar cells were improved as regard to ungettered ones.     

Optical Absorption Properties of Electron Beam Evaporated a-Si_(1-x)Gd_x Films

Optical absorption properties of electron beam evaporated a-Si films(a-Si_(1-x)Gd_x films)are studied forvarious composition x.It is shown from the experimental results that variation of chemical composition in thiskind of materials will lead to a change in near infrared absorption.For 0.1 at%相似文献   

FY-2C卫星太阳电池阵在轨性能分析

风云二号气象卫星(C星)在轨工作近六年,该卫星电源系统采用BSFR太阳电池阵,这是空间电源工程首次在地球静止轨道上应用。母线电流遥测数据分析表明,太阳电池阵在同步轨道四年衰降约11%。     

铜铟镓硒薄膜太阳能电池的发展现状以及应用前景

首先介绍了铜铟镓硒薄膜太阳能电池结构、性能特点以及目前在研究和生产过程中电池的制备方法和工艺;着重阐述了工业发达国家以及相应大公司在铜铟镓硒薄膜太阳能电池方面最新进展以及发展趋势,特别介绍了一些太阳能电池的实验室样品和组件的最高光电转化效率.也对国内在此方面的研究做了简要介绍.文中最后探讨了我国发展铜铟镓硒太阳能电池的可行性和产业化前景.