Impact of Bi3+ heterovalent doping in organic-inorganic metal halide perovskite crystals

• Verfasst von: Nayak, Pabitra K. [VerfasserIn]
• Verfasst von: Sendner, Michael [VerfasserIn]
• Verfasst von: Lovrinčić, Robert [VerfasserIn]
• Verfasst von: Pucci, Annemarie [VerfasserIn]
• Titel: Impact of Bi3+ heterovalent doping in organic-inorganic metal halide perovskite crystals
• Verf.angabe: Pabitra K. Nayak, Michael Sendner, Bernard Wenger, Zhiping Wang, Kshama Sharma, Alexandra J. Ramadan, Robert Lovrinčić, Annemarie Pucci, P.K. Madhu, and Henry J. Snaith
• Jahr: 2018
• Jahr des Originals: 2017
• Umfang: 4 S.
• Fussnoten: Gesehen am 22.01.2020 ; Published: December 21, 2017 ; Im Titel ist "3+" hochgestellt
• Titel Quelle: Enthalten in: American Chemical SocietyJournal of the American Chemical Society
• Ort Quelle: Washington, DC : American Chemical Society, 1879
• Jahr Quelle: 2018
• Band/Heft Quelle: 140(2018), 2, Seite 574-577
• ISSN Quelle: 1520-5126
• DOI: doi:10.1021/jacs.7b11125
• Datenträger: Online-Ressource
• Sprache: eng
• K10plus-PPN: 1688056025

Abstract

Intrinsic organic-inorganic metal halide perovskites (OIHP) based semiconductors have shown wide applications in optoelectronic devices. There have been several attempts to incorporate heterovalent metal (e.g., Bi3+) ions in the perovskites in an attempt to induce electronic doping and increase the charge carrier density in the semiconductor. It has been reported that inclusion of Bi3+ decreases the band gap of the material considerably. However, contrary to the earlier conclusions, despite a clear change in the appearance of the crystal as observed by eye, here we show that the band gap of MAPbBr3 crystals does not change due the presence of Bi3+ in the growth solution. An increased density of states in the band gap and use of very thick samples for transmission measurements, erroneously give the impression of a band gap shift. These sub band gap states also act as nonradiative recombination centers in the crystals.