基于透射率曲线确定聚合物太阳能电池功能层的光学常数和厚度  

Determination of optical constants and thickness of photoactive layer in polymer oslar cells by single transmission measurement

作　　者：黄卓寅[1] 李国龙[1] 李衎[1] 甄红宇[1] 沈伟东[1] 刘向东[1] 刘旭[1] 

机构地区：[1]浙江大学现代光学仪器国家重点实验室,杭州310027

出　　处：《物理学报》2012年第4期498-503,共6页Acta Physica Sinica

基　　金：中央高校基本科研业务费专项基金(批准号:2009QNA5010;2010QNA6003);国家自然科学基金(批准号:61007056);高等学校博士学科点专项科研基金(批准号:20100101120048)资助的课题~~

摘　　要：本文介绍了一种确定聚合物太阳能电池功能层光学常数和厚度的方法.该方法借助于特定的色散模型拟合透射率测试曲线以获得功能层光学常数和厚度值.文中比较了Forouhi-Bloomer和Lorentz-Oscillator模型在体异质结薄膜的透射率拟合计算中的适用性,计算了poly(3-hexylthiophene)(P3HT)/[6,6]-phenylC_(61)-butyric acid methyl ester(PCBM)和poly[2-methoxy-5-5(2'-ethyl-hexyloxy)-1,4-phenylenevinylene](MEH-PPV)/PCBM体异质结薄膜的光学常数和厚度.拟合得到的曲线与实验曲线符合良好,厚度计算的结果与台阶仪测量结果保持一致,误差小于4%.进一步分析得到的热退火和加入高沸点溶剂添加剂后P3HT/PCBM薄膜的光学常数和光学禁带值与相应器件伏安特性相符.该方法适用于所有体异质结的功能层,可用于聚合物太阳能电池的膜系优化和在线检测.We present a simple and accurate method of determininy the optical constant and physical thickness of the photoactive layer in a polymer solar cell.The applicabilities of the physics models including Forouhi-Bloomer and Lorentz-Oscillator models in transmission curve fitting are compared.This method is used to calculate the optical constants and film thicknesses of poly（3-hexylthiophene）（P3HT） /[6,6]-phenyl C_（61）-butyric acid methyl ester（PCBM） and poly[2- methoxy-5-5（2＇-ethyl-hexyloxy）-l,4-phenylenevinylene]（MEHPPV） /PCBM bulk heterojunction,The calculated transmission curves fit to the experimental ones well.The results accord with those reported in the literature and from the step profiler,and their error is less than 4%.The optical constant and the physical thickness of polymer solar cell after the optimization process including thermal annealing and adding high-boiling-point additive are studied,and the results are consistent with the voltage-current characteristics of the cell.This method is suited for bulk heterojunction films and can be used in polymer solar cell optimization and detection system.

关 键 词：聚合物太阳能电池 光学常数 透过率曲线 Forouhi-BIoomer模型 

分 类 号：TM914.4[电气工程—电力电子与电力传动]