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Large Band Gap Narrowing and Prolonged Carrier Lifetime of (C4H9NH3)2PbI4 under High Pressure.

ABSTRACT: Due to their superior optical and electronic properties and good stability, 2D organic-inorganic halide perovskites (OIHPs) exhibit strong potential for optoelectronic applications. However, the large band gap, short carrier lifetime, and high resistance hinder their practical performance. In this work, the band gap is successfully tuned, the carrier lifetime is prolonged, and the resistance of (C4H9NH3)2PbI4 (BA2PbI4) is reduced directly using high pressure. The band gap is decreased to less than 1 eV at 35.0 GPa, and the highest pressure is studied. The carrier lifetime at 9.9 GPa is 20 times longer than that at ambient conditions. Moreover, the resistance is reduced by four orders of magnitude at 34.0 GPa accompanying band gap narrowing. This work indicates that pressure plays an effective role in tuning the optical and electronic structures of BA2PbI4, and also provides a strategy to synthesize high-performance OIHP materials.

SUBMITTER: Yuan Y 

PROVIDER: S-EPMC6685472 | biostudies-literature | 2019 Aug

REPOSITORIES: biostudies-literature

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Large Band Gap Narrowing and Prolonged Carrier Lifetime of (C<sub>4</sub>H<sub>9</sub>NH<sub>3</sub>)<sub>2</sub>PbI<sub>4</sub> under High Pressure.

Yuan Ye Y   Liu Xiao-Fei XF   Ma Xuedan X   Wang Xiaoli X   Li Xin X   Xiao Juan J   Li Xiaodong X   Zhang Hao-Li HL   Wang Lin L  

Advanced science (Weinheim, Baden-Wurttemberg, Germany) 20190611 15

Due to their superior optical and electronic properties and good stability, 2D organic-inorganic halide perovskites (OIHPs) exhibit strong potential for optoelectronic applications. However, the large band gap, short carrier lifetime, and high resistance hinder their practical performance. In this work, the band gap is successfully tuned, the carrier lifetime is prolonged, and the resistance of (C<sub>4</sub>H<sub>9</sub>NH<sub>3</sub>)<sub>2</sub>PbI<sub>4</sub> (BA<sub>2</sub>PbI<sub>4</sub>)  ...[more]

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