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cati0.7mn0.3o3薄膜溶胶-凝胶法制备与光伏性能优化
首发时间：2024-06-03
摘要：catio3是典型的钙钛矿结构先兆性铁电体，常温下其禁带宽度为3-3.5ev，对可见光吸收有限，限制了其在光伏领域的应用。我们前期研究表明，mn掺杂可诱导catio3的铁电性能，并有效降低其禁带宽度。本文基于溶胶-凝胶旋涂法，不同退火温度下制备了cati0.7mn0.3o3薄膜，考察了退火温度对薄膜物相结构、组织形貌、光学性能以及铁电光伏性能的影响。结果表明，只有退火温度大于等于800 ℃ (30 min)后薄膜才呈现结晶状态，但通过光学性能研究发现，退火温度为550 ℃ (30 min)时薄膜中就已形成非晶态的cati0.7mn0.3o3物相；薄膜禁带宽度随退火温度升高单调降低，最低为1.35 ev；进一步的铁电及光伏性能研究发现，退火温度650 ℃时，薄膜呈现出最佳的铁电和光伏性能，其光电转化效率为0.232%。
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preparation of cati0.7mn0.3o3thin film by sol-gel method and optimization of photovoltaic performance
abstract：catio3 is a typical perovskite-typeincipient ferroelectric material. its bandgap is 3-3.5 ev at room temperature, which limits its absorption for visible light and its application in photovoltaics. our previous studyindicated that mn doping can induce the ferroelectric properties of catio3 and effectively reduce its bandgap width.this paper reported the preparation ofcati0.7mn0.3o3 films with different annealing temperatures using a sol-gel spin-coating method, and investigated the effects of annealing temperature on the phase structure, morphology, optical properties, and ferroelectric photovoltaic properties. the results showed that the films exhibited a crystalline state with single cati0.7mn0.3o3 phase when the annealing temperature is only greater than or equal to 800 ℃ (30 min).the study on the optical properties of the films found that the amorphous cati0.7mn0.3o3 phase has already formed in the thin film annealed at 550 ℃ (30 min). moreover, the bandgap of the films monotonically decreased with increasing annealing temperature, and the minimum was about 1.35 ev.further, the studies on the ferroelectric and photovoltaic properties indicated that the film annealed at 650 ℃(30 min) exhibited the best ferroelectric and photovoltaic performance, whose photo-to-electric conversion efficiency was 0.232%.
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cati0.7mn0.3o3薄膜溶胶-凝胶法制备与光伏性能优化
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