According to the report of the Physicist Organization Network on May 29th, the research team led by Rafael Verduzzi, a chemical engineer at Rice University, and Angliqui Gomes, a chemical engineer at Penn State University, developed a Solar cells based on bulk copolymers (self-assembled organic materials that can autonomously form different layers), although the new cell's photoelectric conversion efficiency is only 3%, are still higher than other cells that use polymers as active materials. The researchers said that this new form of battery is expected to open a new field of solar energy equipment research. Related papers were published in the latest edition of Nano Express.

Verduz said that although the current commercial silicon-based solar cells have a photoelectric conversion efficiency of 20%. The highest conversion rate currently obtained in the laboratory is 25%, but since the mid-1980s, scientists have been focusing on the development of polymer-based solar cells, which are expected to significantly reduce the cost of solar energy, however, The results of the study are minimal. Later, the photoelectric conversion efficiency of a solar cell made of a polymer/polyfullerene mixture reached 10%, but the material of polyfullerene itself is difficult to deal with.

Verduz explains: “In theory, bulk copolymers have great potential for use in organic solar cells, but few people currently use high-mass copolymers to make high-performance photovoltaic devices. We believe that once we With the right materials and assembling them under the right conditions, you can get very high performance solar cells."

Researchers at Rice University found that a bulk copolymer, P3HT-b-PFTBT, can be divided into 16 nm wide bands. What makes researchers even more interested is that this polymer is inherently easy to form perpendicular to the glass. The scientists fabricated the copolymer on a glass/indium tin oxide (ITO) surface at 165 degrees Celsius. They placed the copolymer on one end of a device manufactured by researchers at Penn State University, and placed a layer of aluminum on the other end of the device so that the copolymer band extended from the top to the bottom electrode and provided a Clear flow path.

The researchers then plan to experiment with other bulk copolymers and learn how to control their structure to increase the ability of solar energy to capture photons and turn them into electricity. But at present, they will focus on improving the performance of new solar cells, because only then can they solve other challenges including stability.

Verduz said: "It is easy to encapsulate a solar cell to protect it from air and water, but it is difficult to protect it from UV rays because you have to expose it to sunlight. It cannot be avoided."

The researchers said that once they improve the performance of the copolymer solar cells, they will find a long-term use for them. (Liu Xia)

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