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In this work, we perform steady-state, continuous wave (cw), photoluminescence (PL) measurements on MAPb I 3 thin films in the temperature range of 10–160 K, using excitation densities spanning over almost seven orders of magnitude, in particular investigating very low densities that are rarely used in the published literature. The temperature range used in this study is below or at the edge of the orthorhombic-tetragonal phase transition in MAPb I 3. In particular, we show that even in high-quality MAPb I 3, capable of providing high photovoltaic efficiency, the defect density is high enough to give rise to an energy level band. Furthermore, we show that the intensity ratio between the two PL components related to the two crystalline phases is a function of temperature and excitation density. At high excitation intensities, we show that amplified spontaneous emission is attainable even in cw conditions. Time-resolved …
American Physical Society
Publication date: 
26 Mar 2021

Valerio Campanari, Antonio Agresti, Sara Pescetelli, Aswathi K Sivan, Daniele Catone, Patrick O'Keeffe, Stefano Turchini, Aldo Di Carlo, Faustino Martelli

Biblio References: 
Volume: 5 Issue: 3 Pages: 035409
Physical Review Materials