研究目的
To design and synthesize a novel n-type small organic molecule, homologous perylene diimide tetramer (HPDT), for interface engineering in inverted perovskite solar cells (PSCs) to enhance interface contact, decrease energetic barrier and recombination losses, and improve power conversion efficiency.
研究成果
The novel n-type small organic molecule, HPDT, was successfully synthesized and used for interface engineering in inverted PSCs. HPDT showed suitable energy levels and high electron mobility, leading to enhanced electron extraction and reduced recombination losses. The PCE of inverted MAPbI3-based PSCs was greatly improved from 17.38% to 19.75% with negligible hysteresis. This work presents a novel method for interfacial engineering with conductive organic small molecules for high-performance PSCs.
研究不足
The study focuses on the use of HPDT as an interface material in inverted PSCs. The performance of devices using HPDT as the only ETL layer was lower than that of PCBM, possibly due to unsuitable thickness of HPDT resulting in incomplete coverage on the perovskite surface.
1：Experimental Design and Method Selection:
The study involved the design and synthesis of HPDT, a perylene diimide derivative, for use as an interface material in PSCs. The optical band gap and LUMO level of HPDT were calculated, and its interaction with perovskite was studied using X-ray photoelectron spectroscopy (XPS).
2：Sample Selection and Data Sources:
Perovskite films with and without HPDT were prepared and characterized. The performance of PSCs with different thicknesses of HPDT layer was evaluated.
3：List of Experimental Equipment and Materials:
SEM, AFM, steady-state PL spectra, TRPL spectra, SCLC, OFET, and J-V measurements were conducted to characterize the films and devices.
4：Experimental Procedures and Operational Workflow:
HPDT was coated on top of perovskite prior to the deposition of PCBM. The thickness of HPDT layer was varied to study its effect on device performance.
5：Data Analysis Methods:
The electron mobility of HPDT and PCBM was estimated using SCLC and OFET methods. The performance of PSCs was evaluated based on J-V measurements and EQE spectra.
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