Effects of Cesium/Formamidinium Co-Addition to Perovskite Solar Cells

Nonomura, Ren; Oku, Takeo; Ono, Iori; Suzuki, Atsushi; Okita, Masanobu; Fukunishi, Sakiko; Tachikawa, Tomoharu; Hasegawa, Tomoya

doi:10.3390/asec2022-13789

Cited by 1 publication

(1 citation statement)

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“…In this work, we rather focused on the compositional tuning of the A and X-sites in the room atmosphere to improve the stability of the ABX 3 compound [20]. We brought together the two FA and Cs cations in the A-caption and the I and Br anions in the X-caption.…”

Section: Introductionmentioning

confidence: 99%

Boosting the Stability at Room Atmosphere of Lead Halide Perovskites Through a Simultaneous Compositional Tuning of the A-and X-sites

Hien

Bouich

Coulibaly

et al. 2023

Advanced Energy Conversion Materials

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Organic-inorganic lead halide perovskites, particularly the Formamidinium and Cesium based-ones are among the most promising materials for photovoltaic applications, yet they still face a stability issue. In this work, we boosted their structural and environment-resistance stability by the simultaneous compositional tuning of their A-cation and X-anion sites. We prepared 9 different solutions of CsxFA1-xPb(I1-yBry)3 (x = 0.1, 0.2 and 0.3 and y = 0.15, 0.25 and 0.35), made the deposition on FTO substrates by one step spin-coating technique and did the post-annealing at 120 °C instead of the 350 °C for CsPbI3 for instance. We, afterward, characterized the films by X-ray diffraction (XRD), UV-visible spectroscopy, photoluminescence (PL) levels and Field Emission Scanning Electron Microscopy (FESEM) to assess their crystallinity, optical properties and morphology. As a result, we noted that they all crystallized into the perovskite black α-phase and remained stable after 3 weeks in contrast to FAPbI3 or CsPbI3. We also found that their band gap energy ranged between 1.62 eV (for the compounds with 15% of Br) to 1.75 eV, hence their excellent absorbance properties.

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Section: Introductionmentioning

confidence: 99%