光强自助校准的太阳能电池J-V自动测试系统

Auto-Testing J-V Measurement System for Solar Cells with Irradiance Calibration

为解决现有太阳能电池测试系统结构复杂、价格昂贵和使用不便等问题,研制了一种具有光强自动校准功能的太阳能电池J-V(Current Density-Voltage)特性测试系统,能实现多个太阳能电池器件的自动测量。系统由计算机及测试软件、数字源表Keithley2400、输出功率为500 W的氙灯光源及其驱动电源、多器件自动切换及其测量电路、标准光电二极管组成的光电流测量电路及光强校准电路、氙灯工作时长测量电路等模块构成,上位机测试软件采用Visual Basic语言编写。测试软件依据在标准光电二极管测到的光电流,并通过单片机控制的调光电路输出相应的直流电压到氙灯驱动电源,实现了氙灯光强的自动校准和标准100 m W/cm^2AM1.5太阳光谱的输出,同时测试软件通过数字源表和多器件自动测量电路分别测得各器件的J-V特性,并计算出器件的效率等参数。测试结果表明,该系统达到了既定的设计目标,具有成本低、自动化程度高且使用方便等特点。

Because the present J-V measurement systems for solar cells were complex, expensive and inconvenient to use,a new system which can auto-calibrate the xenon lamp irradiance and automatically measure several devices simultaneously was developed. The system consists of a computer,a testing program,a Keithley 2400 source meter,a 500 W xenon lamp and its power supply,an automatic switching and measuring circuit for multiple devices,a xenon lamp operating time measuring circuit,a photocurrent measuring circuit composed of a reference photodiode and an irradiance calibration circuit. PC testing software was written in Visual Basic. The light power of the Xenon lamp was monitored using the photocurrent of a reference photodiode illuminated by the lamp and calibrated to standard 100 m W/cm2 AM 1. 5 solar irradiance before every J-V measurement via modulating the output voltage of the Xenon lamp power supply using a microprocessor. The photocurrent of the custom solar cells under different bias voltage was measured using a Keithley 2400 source meter and a multisample automatic measurement circuit. The J-V curves were plotted and the device parameters such as efficiency were calculated by the testing software. The system proposed is cost-effective,highly automatic and fulfills the requirements of solar cells J-V testing.