Fabrication-Method-Dependent Excited State Dynamics in CH3NH3PbI3 Perovskite Films

被引:5
作者
Kim, In-Sik [1 ]
Jo, Cheol [1 ]
Kang, Rira [2 ]
Kim, Dong-Yu [3 ]
Son, Seong-Jin [1 ]
Hwang, In-Wook [4 ]
Ko, Do-Kyeong [1 ,4 ]
机构
[1] Gwangju Inst Sci & Technol, Dept Phys & Photon Sci, Gwangju 61005, South Korea
[2] Korea Atom Energy Res Inst, Radiat Res Div Ind & Environm, Jeongeup 56212, Jeollabuk Do, South Korea
[3] Gwangju Inst Sci & Technol, Sch Mat Sci & Engn, Gwangju 61005, South Korea
[4] Gwangju Inst Sci & Technol, Adv Photon Res Inst, Gwangju 61005, South Korea
基金
新加坡国家研究基金会;
关键词
CHARGE-CARRIER DYNAMICS; DIFFUSION LENGTHS; HIGH-EFFICIENCY; RECOMBINATION DYNAMICS; MORPHOLOGY; MICROSTRUCTURE; ANNIHILATION; TEMPERATURE; MOBILITIES; SIZE;
D O I
10.1038/s41598-017-16654-1
中图分类号
O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];
学科分类号
07 ; 0710 ; 09 ;
摘要
Understanding the excited-state dynamics in perovskite photovoltaics is necessary for progress in these materials, but changes in dynamics depending on the fabrication processes used for perovskite photoactive layers remain poorly characterised. Here we report a comparative study on femtosecond transient absorption (TA) in CH3NH3PbI3 perovskite films fabricated by various solution-processing methods. The grain sizes and the number of voids between grains on each film varied according to the film synthesis method. At the low excitation fluence of 0.37 mu J cm(-2), fast signal drops in TA dyanmics within 1.5 ps were observed in all perovskite films, but the signal drop magnitudes differed becuase of the variations in charge migration to trap states and band gap renormalisation. For high excitation fluences, the buil-up time of the TA signal was increased by the activated hot-phonon bottleneck, while the signal decay rate was accelerated by fluence-dependent high-order charge recombination. These fluence-dependent dynamics changed for different perovskite fabrication methords, indicating that the dynamics were affected by morphological features such as grain sizes and defects.
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页数:7
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