Improved performance and thermal stability of perovskite solar cells prepared via a modified sequential deposition process

Seongtak Kim, Taewon Chung, Soohyun Bae, Sang Won Lee, Kyung Dong Lee, Hyunho Kim, Seunghun Lee, Yoonmook Kang, Hae Seok Lee, Donghwan Kim

    Research output: Contribution to journalArticlepeer-review

    22 Citations (Scopus)

    Abstract

    In conventional sequential deposition, PbI2-free CH3NH3PbI3 perovskite films can be achieved when the PbI2 substrate reacts with a relatively low-concentration CH3NH3I solution (<8 mg of CH3NH3I per 1 mL of IPA) but the film that is formed has only sparse and uneven coverage. On the other hand, a dense CH3NH3PbI3 perovskite film can be formed on a mesoporous TiO2 substrate when the PbI2 substrate reacts with a relatively high-concentration MAI solution (>8 mg of CH3NH3I per 1 mL of IPA), but unreacted PbI2 is still present in CH3NH3PbI3 layer in such cases. Here, we developed organic-inorganic perovskite solar cells with high efficiency by preparing dense and PbI2-free films using a modified sequential deposition process. By utilizing the reaction behavior between PbI2 and MAI, solar cells with an average power-conversion efficiency of 15.1% and high reproducibility and stability were achieved.

    Original languageEnglish
    Pages (from-to)266-273
    Number of pages8
    JournalOrganic Electronics
    Volume41
    DOIs
    Publication statusPublished - 2017 Feb 1

    Bibliographical note

    Funding Information:
    This work was supported by the New and Renewable Energy Core Technology Program of the Korea Institute of Energy Technology Evaluation and Planning (KETEP), which granted a financial resource (No. 20143030011960) from the Ministry of Trade, Industry, and Energy, Republic of Korea.

    Publisher Copyright:
    © 2016 Elsevier B.V.

    Keywords

    • Conversion rate
    • Perovskite
    • Sequential deposition method
    • Solar cells
    • Thermal stability

    ASJC Scopus subject areas

    • Electronic, Optical and Magnetic Materials
    • Biomaterials
    • General Chemistry
    • Condensed Matter Physics
    • Materials Chemistry
    • Electrical and Electronic Engineering

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