采用碘三离子（I3-）作为提升钙钛矿太阳电池性能的界面修饰材料,对钙钛矿体相及上层空穴传输材料的接触界面进行修饰和改性,钝化光活性层上表面缺陷,以优化光电转换器件的转换效率。由反溶剂法和后处理的形式,制备平面异质结电池,运用该界面钝化策略改善后的器件效率达到18.9%,且电池的稳定性也得到增强,600 h后仅有5%的性能衰减。通过物相和光电性质等表征与测试,系统地研究电池的形貌及性能参数,探究不同浓度的I3-对器件性能的影响作用和机理。研究发现,该缺陷钝化策略对钙钛矿膜层进行处理后,能有效改善钙钛矿材料的结晶性,减少其表面陷阱态缺陷,降低钙钛矿与空穴传输层的载流子界面传输势垒,且I3-与钙钛矿能形成钝化层,起到隔绝水氧的作用,使其稳定性得到改善。
Abstract
Tri-iodine anion I3- is employed as a defect passivator for post-treatment to as-prepared perovskite films, which remarkably improves the interfacial contact between the light-absorbing and the hole transport layer. This strategy on defects is found to significantly enhance power conversion efficiency of planar heterojunction devices to 18.9% by a one-step film deposition method. Meanwhile, the operational stability of PSCs is effectively improved that an efficiency decline of only 5% is observed in the I3--treated device after aging for 600 hours. The film morphology, optoelectrical properties, and the effect and mechanism of I3- with different concentrations on the device performance are investigated by measurement of phase and optoelectronic. The results show that the defect passivation strategy with post-treatment of I3- can benefit preferential growth orientation of the perovskite crystals, reduce trap-state defects, and eliminate the potential energy barrier between the perovskite and the hole transport layer. Furthermore, I3- is helpful to form an in-situ protecting layer which prevents the perovskite material from moisture and oxygen attacks.
关键词
钙钛矿太阳电池 /
缺陷钝化 /
反溶剂 /
界面修饰 /
碘三离子 /
后处理 /
稳定性
Key words
perovskite solar cells /
defect passivation /
anti-solvent /
interface modification /
tri-iodine ions /
post-treatment /
stability
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基金
国家自然科学基金（U20A20245）; 广西“特聘专家”专项经费资助（2019B06）; 广西建筑新能源与节能重点实验室项目（桂科能18-J-21-6）; 桂林理工大学科研启动基金（GUTRD2000002727）
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