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 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 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 (<i>V</i><sub>oc</sub>) of 1.105 V, 91% of the maximum theoretical <i>V</i><sub>oc</sub>, 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. phase;perovskite;V oc;PbS;efficiency;QD;FAPI;band gap 2020-01-14
    https://acs.figshare.com/articles/media/Chemi-Structural_Stabilization_of_Formamidinium_Lead_Iodide_Perovskite_by_Using_Embedded_Quantum_Dots/11604273
10.1021/acsenergylett.9b02450.s002