Organic solar cells can be made into large-area thin-film devices by the solution method, which has the advantages of low cost, light weight, foldability, translucency, etc. With the continuous improvement of the conversion efficiency of the cells, organic solar cells have shown broad application prospects.
Under the support of the National Youth Foundation's Outstanding Youth Fund Project and General Program and the 100-person Plan of the Chinese Academy of Sciences, the Zheng Qingdong Research Group of the State Key Laboratory of Structural Chemistry of Fujian Institute of Materials has made new progress in organic solar cell materials and devices. The team used a mixed film of a germanium-doped germanium polymer and fullerene as the active layer to control the semiconductor metal oxide electrode interface layer to realize a high-stability inversion with an open-circuit voltage of 1.00 to 1.06 V and maintaining a conversion efficiency of more than 5%. Organic solar cells (ACSAppl.Mater.Interfaces, 2013, 5, 9015–9025).
In view of the limitations of current organic photovoltaic device interface materials, the team also cooperated with the Zhang Jian Research Group of Dalian Institute of Chemical Physics, Chinese Academy of Sciences, to improve the performance of organic photovoltaic devices by introducing a ternary zinc oxide (ZMO) film with an adjustable energy level; The ZMO cathode interface buffer layer obtained by the solution method has the advantages that the work function, interface performance, absorption and other properties can be regulated, and can significantly enhance the electron transport and hole blocking capability, increase the short circuit current of the battery, open circuit voltage and fill in the device. As a result, 8.31% of high-efficiency and high-stability organic solar cells were finally obtained.
This study confirms that the ZMO transparent film with adjustable band gap is a new type of interface material that can be used in organic photovoltaic devices. It has pioneered the breakthrough in the efficiency of organic solar cells based on the polynary oxide interface layer by 8%. Related research results have recently been published in the “Advanced Energy Materials" (Adv. EnergyMater. 2014, DOI: 10.1002/aenm.201301404). This study provides an important idea for a new generation of energy gap adjustable multi-component semiconductor thin film design and photovoltaic device applications.
Previously, Zheng Qingdong's research team also designed and synthesized a series of new types of polymer solar cell materials and prepared corresponding devices (J. Mater. Chem., 2012, 22, 16032–16040; Macromolecules, 2013, 46, 4813–4821; ACSMacroLett., 2013, 2, 605–608) was invited to write a review paper on organic conductive polymer energy applications in "Adv.EnergyMater., 2012, 2, 179-218", summarizing one-dimensional nanometers The controllable synthesis strategies of structural organic conductive polymers, and their application prospects in solar cells, lithium batteries and other new energy devices are discussed and reviewed.
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