The energy conversion efficiency, life and cost of photovoltaic cells are important indicators that determine whether they have application value. Because traditional crystalline silicon cells have great advantages in large-scale power generation, the new photovoltaic technology must be industrialized and must seek the most competitive application direction based on its technical characteristics. With the vigorous development of the Internet of Things, various distributed microelectronic products have been widely used. The traditional crystalline silicon battery cannot meet the application requirements of electronic products. Its photovoltaic efficiency under indoor lighting conditions is only 2-6%. The main reason is that the absorption spectrum is seriously mismatched and there is serious charge recombination at low carrier density. effect. Therefore, there is an urgent need in the field to develop new photovoltaic cells that can meet the application needs of microelectronic products.
Recently, with the support of the National Natural Science Foundation of China and the Chinese Academy of Sciences, the team of Hou Jianhui from the Laboratory of Polymer Physics and Chemistry of the Institute of Chemistry, Chinese Academy of Sciences has in-depth research and developed the application of organic photovoltaic cells under indoor light. The team designed and synthesized a new non-fullerene acceptor IO-4Cl, mixed with the polymer donor PBDB-TF, and obtained a photoactive layer with an absorption spectrum matching the indoor light source. Using a 2700 K LED light source as the light source, the open circuit voltage of a 1 cm2 battery reaches 1.10V under 1000 lux irradiation intensity, achieving an energy conversion efficiency of 26.1%.
The research results prove that the OPV battery not only has high photovoltaic efficiency and excellent stability under indoor light, but is also insensitive to series resistance and active layer thickness. For example, after 1000 hours of continuous exposure from an indoor light source, the battery still maintains its initial photovoltaic performance; the 4 cm2 battery prepared using the large-area coating method can still achieve a photovoltaic efficiency of more than 23%. The team worked closely with the team of professors at Linköping University in Sweden to reveal the unique advantages of this type of battery in reducing energy loss, and made a reasonable prediction of its ultimate efficiency. The results show that the limit photovoltaic efficiency of OPV cells under indoor light can reach 50%, which means that there is still a huge room for improvement in the currently achieved photovoltaic efficiency. Related research work was published in the recent Nature Energy (Nat. Energy, 2019, 4, 768). Corresponding authors are Hou Jianhui and Gao Feng, and the first author is Cui Yong.
Figure: (a) Determinants of photovoltaic cell application; (b) Emission spectra of fluorescent lamps, LED lamps and the sun; (c) Absorption spectra of PBDB-TF and IO-4Cl; (d) Donor material PBDB-TF and receiver The stability of the device prepared by the bulk material IO-4Cl under indoor light; (e) the JV curve of the large area device by scratch coating; (f) the efficiency prediction chart under the LED lamp.
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