Researchers layout efficient perovskite solar cell with Mortise-Tenon structure

• Scientists from Nanjing Tech University, Wuhan University of Technology and also National University of Singapore set out to attend to 2 significant issues that should be fixed in order to promote perovskite solar cells (PSCs): condition condensation of perovskite as well as out of balance interface cost extraction, which limit more enhancements in device effectiveness.

The group made use of a thermally polymerized additive N-vinyl-2-pyrrolidone (NVP) as a polymer template in the perovskite film, adhered to by a conventional HTL/Chlorobenzene (CB) option spin-coating process to remove the residual miscellaneous phases and open up the grain limits to form monolithic perovskite grains, thus reducing the defect-related non-radiative recombination. Additionally, this procedure results in the development of a novel "Mortise-Tenon" (M-T) structure for perovskite/HTL composite film, which provides a larger call area between perovskite and HTL, thus helping with hole extraction to attain balanced cost management.

M-T structures are commonly made use of in woodworking for strong links between different materials, giving resistance to twisting. In the recommended configuration, the M-T structure contains the perovskite absorber and also a thermally polymerized additive called N-vinyl-2-pyrrolidone (NVP) made use of for the hole transportation layer (HTL).

According to the researchers, NVP keeps a strong interaction with perovskite precursors during the spin-coating procedure, leading to improved charge transport and high-grade perovskite/NVP films.

The cell layout includes a glass/fluorine-doped tin oxide (FTO) substratum, SnO2-based HTM, perovskite absorber with NVP, spiro-OMeTAD layer, as well as a gold (Au) metal contact.

Comparing the tool efficiency to a reference cell, the champion device achieved a power conversion performance of 24.55%, an open-circuit voltage of 1.187 V, a short-circuit current density of 25.66 mA centimeters − 2, and also a fill aspect of 80.64%. The researchers stressed the benefits of suppressed non-radiative recombination as well as well balanced interface cost extraction because of top notch perovskite crystals and the Mortise-Tenon structure. On the other hand, the reference tool accomplished a performance of 22.91%, an open-circuit voltage of 1.151 V, a short-circuit current density of 25.21 mA cm − 2, and a fill variable of 78.94%.

In addition, the cell with the M-T structure showed exceptional longevity, maintaining over 95% of its first performance for 1100 hrs. The gadget underwent measurement and also certification at the Quality Testing Center for Photovoltaic and also Wind Power Systems of the Chinese Academy of Sciences.

"Our work highlights the function of enhancing the contact area of perovskite layer as well as HTL as well as recommends an one-of-a-kind strategy to realize interfacial charge-extracting equilibrium in perovskite solar cells, which may be an essential technique to achieve reliable gadget in the future," they ended.