Deep Absorbing Porphyrin Small Molecule for High-Performance Organic Solar Cells with Very Low Energy Losses

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• 作者：Ke Gao ; Lisheng Li ; Tianqi Lai ; Liangang Xiao ; Yuan Huang ; Fei Huang ; Junbiao Peng ; Yong Cao ; Feng Liu ; Thomas P. Russell ; Ren茅 A. J. Janssen ; Xiaobin Peng
• 刊名：Journal of the American Chemical Society
• 出版年：2015
• 出版时间：June 17, 2015
• 年：2015
• 卷：137
• 期：23
• 页码：7282-7285
• 全文大小：302K
• ISSN：1520-5126

文摘

We designed and synthesized the DPPEZnP-TEH molecule, with a porphyrin ring linked to two diketopyrrolopyrrole units by ethynylene bridges. The resulting material exhibits a very low energy band gap of 1.37 eV and a broad light absorption to 907 nm. An open-circuit voltage of 0.78 V was obtained in bulk heterojunction (BHJ) organic solar cells, showing a low energy loss of only 0.59 eV, which is the first report that small molecule solar cells show energy losses <0.6 eV. The optimized solar cells show remarkable external quantum efficiency, short circuit current, and power conversion efficiency up to 65%, 16.76 mA/cm², and 8.08%, respectively, which are the best values for BHJ solar cells with very low energy losses. Additionally, the morphology of DPPEZnP-TEH neat and blend films with PC₆₁BM was studied thoroughly by grazing incidence X-ray diffraction, resonant soft X-ray scattering, and transmission electron microscopy under different fabrication conditions.