국립 부경대학교

PKNU and Hanyang university joint research team developed advanced materials that can implement solar cells and LED simultaneously

A joint research team from Pukyong National University and Hanyang university has developed a high-tech single material that can realize next-generation solar cells and light emitting diodes (LED) at the same time.

A research team led by professor Lee Bo-Ram from the department of physics at Pukyong National University and professor Choi Hyo-Seong and phd candidates Song Ho-Chan and Jeong Woo-Hyeon from the department of chemistry at Hanyang university developed ‘Perovskite nanocrystals-based ink' and published the research results in <Advanced materials> (IF=32.086), a world-renowned academic journal in the field of materials science.

The thesis containing their research result is ‘A universal Perovskite nanocrystal ink for high-performance optoelectronic devices’.

The advanced material developed by the research team is SPLE-PNC ink, which uses perovskite nanocrystal (PNC), a photoactive semiconductor material, to materialize high light luminous efficiency and stability.

To manufacture optoelectronic devices used in next-generation solar cells, LEDs, and photodetectors, a method of coating multiple layers of PNC ink layer by layer is used. PNC ink has excellent light absorbing ability and high light emitting efficiency and color purity, but it has limitations in that the performance of optoelectronic devices deteriorates due to the occurrence of surface defects through the process of coating several layers.

The research team succeeded in suppressing surface defects by using a compound called 'diphenylpropylammonium (DPAI)’. As a result, SPLE-PNC ink has a 37% higher light luminous efficiency compared to the existing thin film.

As a result of applying this ink to a solar cell and an LED, which require different inks due to the opposite driving method, both the light conversion efficiency of the solar cell and the luminous efficiency of the LED were greatly improved.

In addition, this ink greatly simplifies the process of optoelectronic devices because it can form a thin film of the required thickness with just one coating. Solar cells using this ink have the highest stability among PNC solar cells reported so far.

The research team predicted that the development technology of this advanced material could accelerate the commercialization of PNC optoelectronic devices such as next-generation solar cells, LEDs, and photodetectors.

This research was carried out with support from the Ministry of science and ICT and the National research foundation of Korea's basic research in science & engineering (brainlink, nano and material technology development, mid-career researcher program and basic research laboratory). <Pukyong Today>

△ The joint research team (Lee Bo-Ram, Choi Hyo-Seong, Song Ho-Chan, Jeong Woo-Hyeon from the left)