Effects of Iodine Doping on Carrier Behavior at the Interface of Perovskite Crystals: Efficiency and Stability

Liu, Guilin; Niu, Xiuxiu; Zhou, Huanping; Chen, Qi

doi:10.3390/cryst8050185

Cited by 9 publications

(7 citation statements)

References 30 publications

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“…Perovskite shows the band gap with reproducibility in absorption spectra unless materials are changed. [25][26][27] Moreover, we have confirmed the narrowing from different measurements, as shown in Fig. S1 (see supplementary data, available online at stacks.iop.org/APEX/12/041002/mmedia).…”

supporting

confidence: 83%

Direct observation of charge transfer at the interface between PEDOT:PSS and perovskite layers

Gotanda

Kimata

Dong

et al. 2019

Appl. Phys. Express

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Although the interface between poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS) and perovskite layers is one of the key factors to determine the open-circuit voltage of inverted perovskite solar cells, this interface remains poorly understood. We investigated the interface by electron spin resonance spectroscopy and found that the PEDOT undergoes dedoping in contact with the perovskite. The holes in PEDOT were reduced by electron transfer from the perovskite. Additional electron transfer occurred upon light irradiation. The electron transfer would be related to lower open-circuit voltages of the inverted structure compared to those of mesoporous and planar structures.

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supporting

confidence: 83%

Direct observation of charge transfer at the interface between PEDOT:PSS and perovskite layers

Gotanda

Kimata

Dong

et al. 2019

Appl. Phys. Express

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“…There are very few papers that reported on the effect that iodine treatment exerts on the efficiency of optoelectronic devices. Upon different iodine treatments, both increase − and decrease of power conversion efficiencies of solar cells were observed. The analysis of this data is complicated by the fact that no unified protocol of iodine-treatment is adopted.…”

Section: Implications Of Iodine Treatment For Optoelectronic Properti...mentioning

confidence: 99%

“…The analysis of this data is complicated by the fact that no unified protocol of iodine-treatment is adopted. In particular: (i) iodine is introduced by different means (into organic halide or Spiro-MeOTAD solution during deposition from the gas phase after deposition of the perovskite), (ii) different iodine activities (partial pressure and concentration) were used, and (iii) no unified procedure of post-treatment after exposure to iodine is used.…”

Section: Implications Of Iodine Treatment For Optoelectronic Properti...mentioning

confidence: 99%

Measure is Treasure: Proper Iodine Vapor Treatment as a New Method of Morphology Improvement of Lead-Halide Perovskite Films

et al. 2020

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It is known that exposure of halide perovskites to iodine vapor causes its severe degradation or doping under high or low iodine partial pressures, respectively. In the present study, we show that there exists a range of conditions between these two extreme cases in which the iodine treatment induces recrystallization of halide perovskites, leading to better crystallinity, enhanced morphology, and optoelectronic properties of the material. This happens because of reversible formation of PbI2 and liquid recrystallizing mediumreactive polyiodide melts CH3NH3I–xI2 (1.5 < x < 2.5) that activate the mass transport. A fine control of the iodine partial pressure, temperature of the substrate, and exposure duration allows to apply this method successfully to mixed-cation and mixed-anion perovskites relevant for photovoltaics applications, thus proving the versatility of the iodine treatment approach.

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“…However, thinking in the opposite direction, increasing the zero drift may make it more suitable for manufacturing resistive switching devices [ 23 , 30 , 31 , 32 , 33 , 34 , 35 ]. Iodine ions are considered to be the culprit of dark current hysteresis due to their low activation energy (0.1–0.6 eV) [ 14 , 16 , 17 ] and diffusion energy barrier (~0.17 eV) [ 21 ].Here, we intentionally change the iodine content in the perovskite by additive native species (iodine ions); an iodine-doped perovskite was introduced [ 36 , 37 ]. It should be noted that normal photovoltaic devices with nonlinear I-V processes complicate the electron-ion hybrid transport.…”

Section: Introductionmentioning

confidence: 99%

Giant Zero-Drift Electronic Behaviors in Methylammonium Lead Halide Perovskite Diodes by Doping Iodine Ions

et al. 2018

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Methylammonium lead halide perovskites have attracted extensive attention for optoelectronic applications. Carrier transport in perovskites is obscured by vacancy-mediated ion migration, resulting in anomalous electronic behavior and deteriorated reliability of the devices. In this communication, we demonstrate that ion migration can be significantly enhanced by doping additional mobile I- ions into the perovskite bulk. Ionic confinement structures of vertical metal oxide semiconductor (MOS) and lateral metal semiconductor metal (MSM) diodes designed to decouple ion-migration/accumulation and electronic transport are fabricated and characterized. Measurement conditions (electric-field history, scan rate and sweep frequency) are shown to affect the electronic transport in perovskite films, through a mechanism involving ion migration and accumulation at the block interfaces. Prominent zero-point drifts of dark current-voltage curves in both vertical and lateral diode are presented, and further varied with the perovskite film containingthe different iodine-lead atomic ratio. The doped perovskite has a large ion current at grain boundaries, offering a large ion hysteresis loopand zero drift value. The results confirmthat the intrinsic behavior of perovskite film is responsible for the hysteresisof the optoelectronic devices, but also paves the way for potential applications in many types of devices including memristors and solid electrolyte batteries by doping the native species (I− ions) in perovskite film.

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Effects of Iodine Doping on Carrier Behavior at the Interface of Perovskite Crystals: Efficiency and Stability

Cited by 9 publications

References 30 publications

Direct observation of charge transfer at the interface between PEDOT:PSS and perovskite layers

Direct observation of charge transfer at the interface between PEDOT:PSS and perovskite layers

Measure is Treasure: Proper Iodine Vapor Treatment as a New Method of Morphology Improvement of Lead-Halide Perovskite Films

Giant Zero-Drift Electronic Behaviors in Methylammonium Lead Halide Perovskite Diodes by Doping Iodine Ions

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