Enhancing quantum dot solar cell efficiency to 11.53%.

Nov 20, 2020 04:03 PM ET
  • An unique innovation that can enhance the performance of quantum dot solar cells to 11.53% has been unveiled. Released in the February 2020 concern of Advanced Energy Materials, it has actually been evaluated as a research that addressed the difficulties postured by the generation of electrical currents from sunshine by solar cells by boosting the hole extraction.
Enhancing quantum dot solar cell efficiency to 11.53%.
Image: Professor Sung-Yeon Jang, UNIST

A research team, led by Professor Sung-Yeon Jang in the School of Energy and Chemical Engineering at UNIST has established a photovoltaic or pv tool that takes full advantage of the performance of quantum dot solar cells by using organic polymers.

Solar cells use a characteristic of which electrons and openings are generated in the absorber layer. The cost-free free electrons and also hole after that move via the cell, producing and also completing openings. It is this activity of electrons and holes that produce electrical energy. For that reason, producing multiple electron-hole pairs and also carrying them are an essential consideration in the layout of reliable solar cells.

The research team switched over one side of the quantum dot solar cells to organic hole transportation materials (HTMs) to far better remove and also transportation openings. This is due to the fact that the newly-developed natural polymer not just has premium opening removing ability, yet likewise stops electrons and also holes from recombining, which allow reliable transport of openings to the anode.

Usually, quantum dot solar cells integrate electron-rich quantum dots (n-type CQDs) and also hole-rich quantum dots (p-type QDs). In this work, the research study team created natural π‐conjugated polymer (π‐CP) based HTMs, which can attain efficiency above that of state‐of‐the‐art HTM, p‐type CQDs. The molecular design of the π‐CPs modifies their optoelectronic buildings, and the charge generation and collection in colloidal quantum dot solar cells (CQDSCs), using them are significantly enhanced.

Therefore, the research team did well in accomplishing power conversion efficiency (PCE) of 11.53% with decent air‐storage stability. This is the highest possible reported PCE amongst CQDSCs making use of organic HTMs, and also higher than the reported best solid‐state ligand exchange‐free CQDSC making use of pCQD‐HTM. "From the perspective of tool processing, tool construction does not need any type of solid‐state ligand exchange action or layer‐by‐layer deposition process, which is favorable for making use of business processing methods," noted the study group.

" This study fixes the problem of opening transport, which has been the major challenge for the genration of electrical currents in quantum dot solar cells," says Professor Jang. "This job recommends that the molecular engineering of organic π‐CPs is an efficient technique for synchronised improvement in PCE and processability of CQDSCs, and also additional optimization could even more improve their performance.".