Photobrightening in Lead Halide Perovskites: Observations, Mechanisms, and Future Potential. Issue 13 (17th December 2019)

• Record Type: Journal Article
• Authors: Andaji‐Garmaroudi, Zahra; Anaya, Miguel; Pearson, Andrew J.; Stranks, Samuel D.
• Is Part Of: Advanced energy materials. Volume 10:Issue 13(2020)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2019-12-17
• Subjects: luminescence -- passivation -- perovskite -- photobrightening -- recombination; Energy harvesting -- Materials -- Periodicals; Energy conversion -- Materials -- Periodicals; Energy storage -- Materials -- Periodicals; Photovoltaics -- Periodicals; Fuel cells -- Periodicals; Thermoelectric materials -- Periodicals; 621.31
• DOI: 10.1002/aenm.201903109
• Languages: English
• ISSNs: 1614-6832

Abstract

Abstract: There has been a meteoric rise in the commercial potential of lead halide perovskite optoelectronic devices since photovoltaic cells and light‐emitting diodes based on these materials were first demonstrated. One key challenge common to each of these optoelectronic devices is the need to suppress nonradiative recombination, a process that limits the maximum achievable efficiency in photovoltaic cells and light‐emitting diodes. In this Progress Report, recent studies that seek to minimize this loss pathway in perovskites through a photobrightening treatment, whereby the luminescence efficiency is enhanced through a light illumination passivation process are examined. The sensitivity of this effect to various experimental considerations is examined, including atmosphere, photon energy, photon dose, and also the role of perovskite composition and morphology; under certain conditions there can even be photodarkening effects. Consideration of these factors is critical to resolve seemingly conflicting literature reports. Proposed mechanisms are scrutinized, revealing that there is now some consensus but further work is needed to identify the specific defects being passivated and elucidate universal mechanisms. Finally, the prospects for these treatments to minimize halide migration and push the properties of polycrystalline films towards those of their single‐crystal counterparts are discussed. Abstract : The enhancement in luminescence efficiency of halide perovskite films through a light passivation treatment is summarized, and the extreme sensitivity of the effect to experimental considerations is detailed to reconcile seemingly conflicting literature reports. The mechanisms are scrutinized and the prospects for these treatments to push the properties of polycrystalline films toward those of their single‐crystal counterparts are discussed.