Chinese researchers use mortise-tenon technology to attach a perovskite absorber to a hole transport layer in a perovskite solar cell.
Researchers from Nanjing University of Technology (China) have designed a perovskite solar cell that uses a Mortise-Tenon (MT) structure to create a large interface between a perovskite absorber and a hole transport layer (HTL). They claim that this contributes to improving cell efficiency and durability.
MT frames are commonly used in the carpentry industry to create strong connections between different materials and provide torsional resistance. In the proposed structure, the MT structure is formed by a thermally polymerized additive called N-vinyl-2-pyrrolidone (NVP) used for the perovskite absorber and hole transport layer (HTL).
According to the scientists, NVP maintains strong interactions with perovskite precursors during the spin coating process, which improves charge transport and the quality of perovskite/NVP films.
The cell design includes a fluorine-doped tin oxide (FTO)/glass substrate, a SnO2-based HTM, a perovskite absorber with NVP, a spiro-OMeTAD layer, and a gold (Au) metal contact.
Comparing the device performance with a reference cell, the champion device achieved a power conversion efficiency of 24.55%, an open circuit voltage of 1.187 V, a short circuit current density of 25.66 mA cm -2 and a fill factor of 80.64. % Thanks to the high-quality perovskite crystals and the Mortise-Tenon structure, the researchers highlight the advantages of non-radiative recombination suppression and charge-equilibrium extraction of the interface.
In contrast, the reference device achieved an efficiency 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 factor of 78.94%.
In addition, the MT structure cell exhibited excellent durability, retaining more than 95% of its initial efficiency for 1100 hours. The device was calibrated and certified at the Photovoltaic and Wind System Quality Testing Center of the Chinese Academy of Sciences.
They provided cell technology”Monolithic-Grant Perovskite Solar Cell with Mortise-Tenon System for Charge Extraction Balancing” (Monolithic Grain Perovskite Solar Cell with Mortise-Tenon Structure for Charge Extraction Balancing), recently published Natural communication.
“Our work highlights the importance of increasing the contact area between the perovskite layer and the HDL, and proposes a unique strategy to achieve interfacial charge extraction balance in perovskite solar cells, which may be an important approach to achieve efficient devices in the future”, they conclude.
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