Chemi-Structural Stabilization of Formamidinium Lead Iodide Perovskite by Using Embedded Quantum Dots

The approaches to stabilize the perovskite structure of formamidinium lead iodide (FAPI) commonly result in a blue shift of the band gap, which limits the maximum photoconversion efficiency. Here, we report the use of PbS colloidal quantum dots (QDs) as a stabilizing agent, preserving the original l...

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Published inACS energy letters Vol. 5; no. 2; pp. 418 - 427
Main Authors Masi, Sofia, Echeverría-Arrondo, Carlos, Salim, K. M. Muhammed, Ngo, Thi Tuyen, Mendez, P. F, López-Fraguas, Eduardo, Macias-Pinilla, David F, Planelles, Josep, Climente, Juan I, Mora-Seró, Iván
Format Journal Article
LanguageEnglish
Published American Chemical Society 14.02.2020
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Summary:The approaches to stabilize the perovskite structure of formamidinium lead iodide (FAPI) commonly result in a blue shift of the band gap, which limits the maximum photoconversion efficiency. Here, we report the use of PbS colloidal quantum dots (QDs) as a stabilizing agent, preserving the original low band gap of 1.5 eV. The surface chemistry of PbS plays a pivotal role by developing strong bonds with the black phase but weak ones with the yellow phase. As a result, a stable perovskite FAPI black phase can be formed at temperatures as low as 85 °C in just 10 min, setting a record of concomitantly fast and low-temperature formation for FAPI, with important consequences for industrialization. FAPI thin films obtained through this procedure reach an open-circuit potential (V oc) of 1.105 V, 91% of the maximum theoretical V oc, and preserve the efficiency for more than 700 h. These findings reveal the potential of strategies exploiting the chemi-structural properties of external additives to relax the tolerance factor and optimize the optoelectronic performance of perovskite materials.
ISSN:2380-8195
2380-8195
DOI:10.1021/acsenergylett.9b02450