Probing the Intrinsic Thermal and Photochemical Stability of Hybrid and Inorganic Lead Halide Perovskites

Abstract

We report a careful and systematic study of thermal and photochemical degradation of a series of complex haloplumbates APbX (X = I, Br) with hybrid organic (A = CHNH) and inorganic (A = Cs) cations under anoxic conditions (i.e., without exposure to oxygen and moisture by testing in an inert glovebox environment). We show that the most common hybrid materials (e.g., MAPbI) are intrinsically unstable with respect to the heat- and light-induced stress and, therefore, can hardly sustain the real solar cell operation conditions. On the contrary, the cesium-based all-inorganic complex lead halides revealed far superior stability and, therefore, provide an impetus for creation of highly efficient and stable perovskite solar cells that can potentially achieve pragmatic operational benchmarks.

Synergy of Hydrophobic Surface Capping and Lattice Contraction for Stable and High‐Efficiency Inorganic CsPbI2Br Perovskite Solar Cells

“…In just a few years, the most celebrated perovskite solar cells have achieved power conversion‐efficiency (PCE) as high as 23.2% . However, their poor stability has been a challenging problem, mainly due to the inherent instability of their organic components . Gratifyingly, by replacing the organic cation with Cs + , their compositional stability is greatly improved …”

Metal halide perovskite nanocrystals and their applications in optoelectronic devices

“…For example, under environmental stress, MAPbI 3 dissociates into PbI 2 and CH 3 NH 3 I, and CH 3 NH 3 I is volatile. All‐inorganic perovskites do not produce volatile decomposition at relatively high temperature, which is more stable under various stresses . For CsPbBr 3 and CsPbCl 3 , they have large band gaps and cannot produce a wide range of optical absorption, which is not very appropriate for solar cells.…”

Anorganische CsPbX3‐Perowskit‐Solarzellen: Fortschritte und Perspektiven

“…550 8 8Ct hermisch stabil ist und dass die Zersetzung zudem auf den Verlust von PbBr 2 und nicht von CsBr zurückzuführen ist. [63] Es ist bekannt, dass Elektronenstrahlen hybride HaPs schnell beschädigen. [61] Sie fanden, dass von den Parametern Feuchtigkeit, Sauerstoff,U V-Licht (365 nm), Innenlicht und UV + O 3 Wasserdampf der einzige Parameter war, der das HaP deutlich abbaute.…”

“…Verschiedene organische Spezies wurden zu diesem Zweck eingesetzt:P olyvinylpyrrolidon (PVP) (Abbildung 6b), [117] Polyethylenoxid (PEO), [118] Sulfobetain-Zwitterionen (Abbildung 6c), [119] Phenyltrimethylammoniumbromid (PTABr), [17] Phenylethylammoniumkation (PEA) [120] und Diethylentriamin (DETA). [17] und [63] erfolgte die Behandlung nach der CsPbI 3 -Abscheidung,und wie erwartet gab es keine Veränderung der Kristallgrçße,d ennoch erhçhte die Behandlung die Phasenstabilität. [17] und [63] -s cheint das Gesamtergebnis ähnlich zu sein, nämlich dass die großen organischen Spezies die Kristallisation des HaP unterdrücken und zu viel kleineren Kristallgrçßen führen, welche die Stabilisierung der schwarzen Phasen fçrdern.…”