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Polymer Passivated All Inorganic Micro‐Structured CsPbIxBry Perovskite Toward Highly Efficient Photodetectors
Advanced Electronic Materials ( IF 6.2 ) Pub Date : 2024-05-03 , DOI: 10.1002/aelm.202400042
Shruti Shah 1 , Ashvini Punde 1 , Dhanashri Kale 1 , Yogesh Hase 1 , Somnath Ladhane 1 , Swati Rahane 1 , Vidya Doiphode 1 , Pratibha Shinde 1 , Ashish Waghmare 1 , Bharat Bade 1 , Sachin Rondiya 2 , Mohit Prasad 3 , Shashikant P. Patole 4 , Sandesh Jadkar 1
Affiliation  

Solution‐processed inorganic perovskites cause chemical and structural defects unfavorable for photodetector application. Using a binary solvent, defects in CsPbIxBry (CPIB) perovskite are passivated with poly 4‐vinylpyridine (PVP) and Poly methyl methacrylate (PMMA) polymers. X‐ray photoelectron spectroscopy and FTIR spectra reveal a Lewis base‐acid interaction between Pb2+ and polymer, confirming the passivation of CPIB perovskite. Scanning electron microscopy analysis shows a dual‐surface morphology with microribbons and microcrystals in perovskites. After PMMA treatment, CPIB perovskite exhibits a blue shift in the bandgap (1.8 to 1.95 eV), while the PVP induced a redshift, reducing the bandgap to 1.7 eV. Blue shift in PL analysis indicates modification of grain boundaries. A higher lifetime obtained for CPIB/PVP confirms the restraint of non‐radiative recombinations. Photodetectors are fabricated with pristine CPIB, CPIB/PVP, and CPIB/PMMA perovskites. The passivated CPIB/PVP‐based photodetector exhibits a quick rise time of ≈23 ms and a decay time of ≈17 ms. It also demonstrates a remarkable photoresponsivity of 23 mA W−1, an internal quantum efficiency of 4.9%, and a detectivity of 15.0 × 1010 Jones at 10 mW cm−2 light intensity. This approach shows the potential for environmentally stable polymers to passivate inorganic perovskites for high photodetection performance.

中文翻译:

聚合物钝化全无机微结构 CsPbIxBry 钙钛矿以实现高效光电探测器

溶液处理的无机钙钛矿会导致化学和结构缺陷,不利于光电探测器的应用。使用二元溶剂,CsPbI 中的缺陷Xy(CPIB)钙钛矿用聚 4-乙烯基吡啶(PVP)和聚甲基丙烯酸甲酯(PMMA)聚合物钝化。 X 射线光电子能谱和 FTIR 光谱揭示了 Pb 之间的路易斯碱酸相互作用2+和聚合物,证实了 CPIB 钙钛矿的钝化。扫描电子显微镜分析显示钙钛矿中具有微带和微晶的双表面形态。经过 PMMA 处理后,CPIB 钙钛矿在带隙中表现出蓝移(1.8 至 1.95 eV),而 PVP 则引起红移,将带隙降低至 1.7 eV。 PL 分析中的蓝移表明晶界发生了改变。 CPIB/PVP 获得的较高寿命证实了非辐射复合的限制。光电探测器采用原始 CPIB、CPIB/PVP 和 CPIB/PMMA 钙钛矿制造。基于钝化的 CPIB/PVP 光电探测器具有约 23 ms 的快速上升时间和约 17 ms 的衰减时间。它还表现出 23 mA W 的卓越光响应性−1,内量子效率为4.9%,探测率为15.0×1010琼斯在 10 mW cm−2光强度。这种方法显示了环境稳定的聚合物钝化无机钙钛矿以获得高光电检测性能的潜力。
更新日期:2024-05-03
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