A gaggle of researchers in Germany has developed a non-fullerene acceptor-based natural photovoltaic cell with a bilayer solution-processed gap transporting layer. It recorded an influence conversion effectivity of 17.1% and maintained 93% of its preliminary effectivity after 1,800 hours below steady photo voltaic cell operation at 60 C.
A gaggle of scientists from Friedrich-Alexander-Universität in Germany has offered an natural photovoltaic cell based mostly on a gap transport layer (HTL) based mostly on PEDOT:PSS, a polymer identified for its low price and simple preparation properties.
In the analysis paper, “A polymer bilayer gap carrying layer structure for high-efficiency and steady natural photo voltaic cells,” which was revealed within the journal JouleThe researchers say that regardless of vital progress in laboratory-scale natural photo voltaic cells, there’s nonetheless a scarcity of interface supplies that may be solution-processed on high of the energetic layer, appropriate with novel non- fullerene acceptors (NFAs) and in addition present enough long-term stability.
The scientists defined that the proposed HTL supplies “distinctive stability” for cells based mostly on NFA supplies and inverted structure. The bilayer HTL consists of doped poly[bis(4-phenyl)(256-trimethylphenyl)amine(PTAA)nanoparticlesandpolymerPEDOT:PSS[bis(4-phenyl)(256-trimethylphenyl)amine(PTAA)nanoparticlesandthepolymerPEDOT:PSS[bis(4-phenyl)(256-trimethylphenyl)amine(PTAA)nanoparticleugangpolymerPEDOT:PSS[bis(4-phenyl)(256-trimethylphenyl)amine(PTAA)nanoparticlesandthepolymerPEDOT:PSS
The researchers say that doped PTAA nanoparticles (D-PTAAnp) act as a buffer layer, providing proper alignment of hole transport levels and enabling efficient hole extraction, while PEDOT:PSS forms a dense layer, which protects the active layer and “further enables Ohmic contact. to the Ag electrode”.
In testing, the researchers found that the cell can achieve a power conversion efficiency of 17.1%, which they say is one of the highest reported efficiencies for inverted OPVs. cell using PEDOT:PSS as HTL.
After 1,600 hours under the illumination of a metal-halide lamp at room temperature, the device retains 95% of its initial performance. After 1,800 hours operating under metal-halide lamp illumination at 60 C it retained 93% of its performance, leading the team to conclude the device’s “excellent operational stability”.
To demonstrate the universality of the interlayer, the researchers chose four organic semiconductor composites, including PM7: Y6, PTQ11: Y6, PM6: DT-Y6, and PM6: BTP-eC9: L8-BO. The PM6:BTP-eC9:L8-BO device based on bilayer HTL achieved a PCE of 17.1%.
“To the best of our knowledge, this is one of the highest efficiencies reported so far for inverted OPV cells with solution-processed HTL,” the scientists said. “Overall, the performance and stability values achieved while incorporating a solution-processed top PEDOT:PSS layer present a key tool that can be used in industrially scalable PM6:Y6 modules .
In December, another group of scientists at Friedrich-Alexander Universität in Germany set an efficiency record of 14.46% for an organic PV module.
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