基于含硒窄带隙聚合物太阳能电池的性能

Performances of Photovoltaic Cells Based on Se-Containing Low-Bandgap Polymer

为扩展聚合物太阳能电池的光谱响应范围,选用含硒窄带隙聚合物———聚[2, 7-(9,9-二正辛基)芴-5,5’-(4,7-二硒吩-2,2’-基)-2,1,3-苯并硒二唑] (PFSeBSe)作电子给体,C60衍生物(PCBM)作电子受体,将二者共混,制备了单活化层聚 合物太阳能电池.研究表明,PFSeBSe与PCBM的最佳混合质量比约为1∶4,在AirMass 1.5(100mW·cm-2)模拟太阳光源辐照下,用LiF/Al作为阴极,器件的最大能量转换效 率为0.423%,光敏响应可扩展到700nm以上,比文献报道的结果红移了30～50nm,表明 该体系的吸收与地表太阳光谱能量分布更加匹配.

Se-containing low-bandgap polymer—poly[2,7-(9,9-dioctyl)fluorene-co-5,5’-(4,7 -diselenophenyl)-2,2’-yl-2,1,3-benzoselenodiazole] (PFSeBSe) was used as the electron donor in order to expand the spectral response region of polymer photovoltaic cells (PPVCs). Single-layer PPVC was made by blending PFSeBSe with C60 derivative (PCBM), the electron acceptor. The results indicate that the optimal blend ratio of PFSeBSe to PCBM is about 1∶4 (in mass), and that a maximum power conversion efficiency of 0.423% under Air Mass 1.5 solar simulator (100mW·cm -2), can be obtained when LiF/Al is used as the cathode. The photosensitivity of the cell expands to more than 700nm, which is 30~50nm red-shifted compared with the results in the literature, suggesting a better match of the absorption of the blend system to the terrestrial solar spectrum.