Comparing the Effect of Mesoporous and Planar Metal Oxides on the Stability of Methylammonium Lead Iodide Thin Films
Bibliographic record
Abstract
The family of lead halide perovskites has revolutionized the field of solution-processed photovoltaics; however, the parent member of this family, CH 3 NH 3 PbI 3, is known to be unstable in the presence of water vapor. It degrades through a series of discrete hydrate phases (CH 3 NH 3 PbI 3 ·H 2 O and (CH 3 NH 3 ) 4 PbI 6 ·2H 2 O), eventually forming PbI 2 after long exposures. While this decomposition process has limited the commercial utility of perovskite-based devices, recent studies have suggested that the electron-transport layer can have a pronounced effect on device longevity. In this work, we combine in situ absorbance spectroscopy and in situ grazing incidence wide-angle X-ray scattering measurements to quantitatively investigate how the choice of metal oxide support (planar TiO 2, mesoporous TiO 2, or mesoporous Al 2 O 3 ) affects the stability of the perovskite film in the presence of moisture. We demonstrate that the monohydrate phase forms rapidly when methylammonium lead iodide is deposited on a compact TiO 2 layer, but that the rate of perovskite decomposition is much slower when mesoporous supports are used. Furthermore, mesoporous Al 2 O 3 layers act as better protective barriers than mesoporous TiO 2, suggesting a route toward robust perovskite solar cells with better resistance to humidity and longer device lifetimes.
Fetched live from OpenAlex and de-inverted. Abstracts are not stored in this database: the inverted indexes are 8.6 GB of the frame’s 9.3 GB of text, and the host has 13 GB free.
How this classification was reachedexpand
Full frame distilled prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. Learned from the 10,348 direct Codex labels and 10,348 direct Gemma labels. Candidate is the union of thresholded teacher heads; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels or direct frontier model labels.
Codex and Gemma teacher scores by category
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.001 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.000 | 0.000 |
Machine scores (provisional)
The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.
Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
score_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from itClassification
machine, unvalidatedMachine predicted; a candidate call from one teacher head, not a consensus.
How this classification was reached, model by model and score by score, is at the end of the page under "How this classification was reached".