Contactless Determination of Optimal Chloride Concentration for Power Conversion Efficiency in CH3NH3Pb(Cl,I)3 Using Photoluminescence Spectroscopy

Photonics

Takaho Asai¹  Seigo Ito²  Takayuki Makino³ 

[1] Department of Electric and Electronics Engineering, University of Fukui, Fukui 910-8507, Japan;Department of Materials and Synchrotron Radiation Engineering, University of Hyogo, Himeji 671-2280, Japan;Research Center for Development of Far-Infrared Region, University of Fukui, Fukui 910-8507, Japan;

关键词: spectroscopy;    excitons;    perovskite solar cells;    luminescence;    alloying effect;   

DOI  :  10.3390/photonics8100412

来源: DOAJ

【 摘 要 】

We applied room-temperature photoluminescence (PL) spectroscopy for the compositional engineering of a CH₃NH₃Pb(Cl,I)₃ light harvester in an alloy-based perovskite solar cell. This spectroscopic characterization determines the optimal Cl concentration where the power conversion efficiency shows its maximum in a contactless and non-destructive manner. The PL quenching ratio evaluated from the comparative PL studies between the films grown on glass/ZrO₂ and SnO₂:F/TiO₂ substrates exhibited its maximum at a Cl concentration of 10 mol%, which agrees with the Cl concentration determined from the current–voltage measurement-based device performance. We also discuss the possible reasons for the coincidence mentioned above regarding the charge extraction effect induced by Cl incorporation.

【 授权许可】

Unknown