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热处理对不同溶剂制备的共混体系太阳电池性能影响
Annealing treatment effects on the performances of solar cells based on different solvent blend systems
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摘要: 本文以poly（3-hexylthiophene）（P3HT）为电子给体材料，[6，6]-phenyl C61-butyric acid methyl ester（PCBM）为电子受体材料，制备出不同溶剂形成的共混体系太阳电池．从薄膜的紫外一可见吸收光谱（uV—vis）、光致发光谱（PL）、原子力表面图形（AFM）等方面，分析了热处理对不同溶剂制备的共混体系太阳电池性能的影响．结果表明较高沸点的溶剂有利于P3HT：PCBM共混体系中P3HT的有序化排列，薄膜的紫外一可见吸收和光致发光增强，太阳电池的能量转换效率增大．经130℃热处理后，各种溶剂制备的共混膜的紫外一可见吸收及光致发光进一步增强，器件能量转换效率进一步增大．而其中又以低沸点氯仿为溶剂制备的太阳电池能量转换效率提高最为明显．以氯苯为溶剂制备的太阳电池，经130℃热处理后，在100mW／cm。强度光照射下，其开路电压％，为0．57V，短路电流密度Jsc为8．74mA／cm^2，填充因子FF为59．2％，能量转换效率η为2．95％．Abstract: The solar cells based on different solvent blends of poly（3-hexylthiophene） （P3HT） and [6,6 ]-phenyl C61-butyric acid methyl ester （PCBM） as acceptors are fabricated. Annealing treatment effects on the performances of solar cells based on different solvent blend systems are analyzed by UV-vis absorption spectroscopy and photoluminescence （PL） spectroscopy. The results show that high boiling point solvent leads to an enhanced P3HT ordering in the P3HT：PCBM blend system, and causes an increased incident light absorption and PL spectrum, which contributes to the enhancement of device performance. After 130 ~C thermal annealing, The UV-Vis absorption, PL spectrum and the performance of the device are further enhanced. The performance of the device prepared with low boiling point chloroform solvent increases obviously after thermal annealing. The solar cell prepared with chlorobenzene solvent after 130 ~C thermal annealing achieves an open circuit voltage（Voo） of O. 57 V, short circuit current density （Iso） of 8.74 mA/cm2 , fill factor （FF） of 59.2% and power conversion efficiency （PCE） of 2.95% under 100 mW/cm2 air-mass 1.5 solar simulator illumination.
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