Enhancing Structural Stability of Perovskite Solar Cells Using Naphthalene Diimide Derivative as a C60 Bonding Layer
Gyeong-Ho Jeong a, Ji-Youn Seo a
a Laboratory of Nano Energy Harvesting Materials and Devices, Department of Nano Energy Engineering, Pusan National University, Korea
Poster, Gyeong-Ho Jeong, 089
Publication date: 24th October 2023

In p-i-n structured perovskite solar cells (PSCs), C60 material is widely employed as the electron transport material (ETM). However, due to the relatively weak adhesion between C60 and perovskite, the bonding is susceptible to disruption by external impacts, ultimately resulting in stability degradation issues. Herein we introduce naphthalene diimide derivative (NDI-D) as an C60 bonding layer in PSC. NDI-D material is a planar structure composed of pi-conjugation, allowing for some pi-pi stacking and van der Waals interactions with C60. We have not only ensured structural stability using NDI-D, which incorporates functional groups capable of interacting with perovskite, but also improved the electrical performance of the device. We found that strong adhesion with NDI-D between perovskite and C60 and lifetime of electrons is increased compared to the pristine device.  The perovskite solar cell characteristics were observed through techniques such as PL (photoluminescence), TRPL (time-resolved photoluminescence), UPS (ultraviolet photoelectron spectroscopy) and SEM (scanning electron microscopy).

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