Ferroelectric Coupling Effect on the Energy‐Band Structure of Hybrid Heterojunctions with Self‐Organized P(VDF‐TrFE) Nanomatrices

Shin, Kyung-Sik; Kim, Tae Yun; Yoon, Gyu Cheol; Gupta, Manoj; Kim, Sung Kyun; Seung, Wanchul; Kim, Hyeok; Kim, Sungjin; Kim, SeongMin; Kim, Sang Woo

doi:10.1002/adma.201400405

Cited by 33 publications

(22 citation statements)

References 34 publications

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“…Unfortunately, the polarization by only an EEF is not stable since it is easily screened by the ion migration or accumulation after storing for some time. Ferroelectric (FE) polymers are a group of crystalline polar materials which can maintain a permanent electric polarization in an EEF, offering a stable and controllable electric field in the photoelectric device . This provides an opportunity for us to enhance the BIF in PSCs by applying strong and stable polarization in a novel and facial route.…”

Section: Perovskite Solar Cell Performance Parametersmentioning

confidence: 99%

Polarized Ferroelectric Polymers for High‐Performance Perovskite Solar Cells

et al. 2019

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as electric defects, [7,8] charge trapping, [9,10] ion migration, [11,12] and charge accumulation [13,14] are yet to be properly elucidated. These aforementioned issues are strongly associated with the low build-in field (BIF) for charge separation and transporting, bad interface matching, and poor crystallization of perovskite films. Generally, in a photovoltaic device, BIF is the main force to guide the carriers to drift toward corresponding electrodes to avoid recombination. A small BIF will make the carriers be either captured in the trap states or accumulated at the interfaces due to the insufficient driving force provided. Actually, the BIF in the device is normally too small to provide sufficient force to separate charges and transport them, thus resulting in nonradiative recombination of charges or charge-transfer excitons. [15,16] Energy loss (E loss ) is also easily caused by nonradiative recombination of charge carriers in absorber layer and at interfaces. Although the E loss in perovskite solar cells is lower than other photovoltaic technologies except crystalline silicon cells, [17] an E loss as small as possible is desired to realize high-performance PSCs. Meanwhile, the low-quality perovskite crystals significantly limit their optoelectronic properties and thus device performance. [18,19] Defects and trap states generated by difficultto-control nucleation and crystal growth in solution-processed perovskite film will cause a large energy loss in the device. [20,21] Additionally, there is a need to reduce current hysteresis that could cause inaccurate estimation of device efficiency. [22][23][24] Various methods such as film processing, [25,26] additive, [27,28] doping, [29][30][31] and interface abduction [32] have been used to improve the crystalline quality of perovskite films through the modification of the nucleation and growth process. However, few effective methods are reported to enhance BIF with a purpose to improve the carrier's separation and transport. A relevant approach recently reported is the application of an external electric field (EEF) to the photoactive layer in photovoltaic devices to enhance BIF and suppress carrier recombination at trap sites. [33][34][35] And the vertical polarization induced by an EEF could contribute a preferred in-plane stacking mode for perovskite crystals to grow along the out-plane direction. [35] Unfortunately, the polarization by only an EEF is not stable since it is easily screened by the ion migration or accumulation after storing for In hybrid organic-inorganic lead halide perovskite solar cells, the energy loss is strongly associated with nonradiative recombination in the perovskite layer and at the cell interfaces. Here, a simple but effective strategy is developed to improve the cell performance of perovskite solar cells via the combination of internal doping by a ferroelectric polymer and external control by an electric field. A group of polarized ferroelectric (PFE) polymers are doped into the methylammonium lead iodide (MAPbI 3 ) layer and/or...

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Section: Perovskite Solar Cell Performance Parametersmentioning

confidence: 99%

Polarized Ferroelectric Polymers for High‐Performance Perovskite Solar Cells

et al. 2019

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“…These methods introduced novel technique to increase output current and voltage but increased contact resistance as well resulting in reduction of output power [ 70 ]. Shin et al [ 75 ] designed novel structure of P(VDF-TrFE) self-organized nanomatrix to increase output performance without increasing contact resistance. Figure 9 a shows that phase separation of P(VDF-TrFE) and P3HT was formed by preferential interaction and thermal annealing of the P(VDF-TrFE):P3HT blend solution.…”

Section: Ferroelectric Materials In Energy Harvestingmentioning

confidence: 99%

“…b Energy band structure of P(VDF-TrFE):P3HT/ZnO junction modified by ferroelectric polarization. c Ferroelectric polarization-affected V OC and J SC (Reproduced from [ 75 ] with copyright permission from 2014 John Wiley & Sons) …”

Section: Ferroelectric Materials In Energy Harvestingmentioning

confidence: 99%

Application of ferroelectric materials for improving output power of energy harvesters

Kim

2018

Nano Convergence

Self Cite

101

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In terms of advances in technology, especially electronic devices for human use, there are needs for miniaturization, low power, and flexibility. However, there are problems that can be caused by these changes in terms of battery life and size. In order to compensate for these problems, research on energy harvesting using environmental energy (mechanical energy, thermal energy, solar energy etc.) has attracted attention. Ferroelectric materials which have switchable dipole moment are promising for energy harvesting fields because of its special properties such as strong dipole moment, piezoelectricity, pyroelectricity. The strong dipole moment in ferroelectric materials can increase internal potential and output power of energy harvesters. In this review, we will provide an overview of the recent research on various energy harvesting fields using ferroelectrics. A brief introduction to energy harvesting and the properties of the ferroelectric material are described, and applications to energy harvesters to improve output power are described as well.

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“…Nevertheless, their inherently low photocurrents (in the range of nA-µA/cm 2 ) have resulted in poor overall photovoltaic efficiency [19]- [20]. A way to improve the photovoltaic current of FEoxide solar cells is through the combination with organic [31]- [34] or inorganic light absorbers [21]- [27].…”

Section: A Solar Transistor and Photoferroelectric Memorymentioning

confidence: 99%

A Solar Transistor and Photoferroelectric Memory

Pérez‐Tomás

Lima

Billon

et al. 2018

Adv Funct Materials

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Transistors switch a semiconductor conductive state (or on-state) and an insulator state (or off-state) by means of a third additional terminal known as gate [1]- [3]. An external bias between their two flow electrodes is always required for channel carriers to move, and this bias represents an undesirable yet unavoidable energy consumption. Harvesting the photon energy, a photovoltaic junction would already act as a self-powered current source, but incipient photovoltaic switches do not have a stable low energy consumption state [4]- [10]. Here, we report a new photo-ferroelectric transistor device concept based on a ferroelectric oxide (FEoxide)/organic semiconductor heterojunction, where an insulating FE-oxide (Pb(ZrxTi1-x)O3) acts as a reversibly polarizable electron transport media of the organic bulk heterojunction (P3HT:PCBM) photogenerated carriers. Therefore we demonstrate two terminal (i.e. gate-less), low-cost (metal-oxide solutionprocessed), self-powered and non-volatile phototransistors that switch between bi-stable on and off states and with a low energy consumption in the off state.A phototransistor, photo-switch or photo-FET [11]-[13] can be defined as a three-terminal device whose output can be simultaneously and independently controlled by light or voltage [14]. Ideally, the phototransistor concept should be integrated into a vertical (sandwich-like) two-terminal device for larger density of miniaturization [15] while keeping a normally-off state for better dissipation efficiency and easier control [16]. A reliable, cleanroom-less, low cost two-terminal phototransistor would represent a paradigm shift for the next generation of sustainable embodiments such as photodetectors, smart windows, flexible detector systems and optical memories [17]. Nevertheless, such a device is unconventional and challenging since a photovoltaic semiconductor Schottky or p-n junction does not switch as internal fields and chemical potentials are not bi-stable [16]. There are however several photo-switchable mechanisms that can result in diverse types of photovoltaic responses; these include ferroelectric photovoltaics [4]-[6], light-induced ionic drift in halide perovskites [7], [8], photovoltaic resistive switching [9] and the photochromic effect [10]. Among the photovoltaic mechanisms enabling switching responses, ferroelectric oxides (FE-oxide) possess useful features in their switchable properties (a changeable direction of current and voltage by polarization switching) and in their anomalous photovoltaic effect that can generate photovoltages much bigger than the band-gap [18] [19]. Nevertheless, their inherently low photocurrents (in the range of nA-µA/cm 2 ) have resulted in poor overall photovoltaic efficiency [19]-[20]. A way to improve the photovoltaic current of FEoxide solar cells is through the combination with organic [31]-[34] or inorganic light absorbers [21]-[27].It has been theoretically [28] and experimentally demonstrated [29], [30] that ferroelectrics bend their electronic band structure and offs...

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Ferroelectric Coupling Effect on the Energy‐Band Structure of Hybrid Heterojunctions with Self‐Organized P(VDF‐TrFE) Nanomatrices

Cited by 33 publications

References 34 publications

Polarized Ferroelectric Polymers for High‐Performance Perovskite Solar Cells

Polarized Ferroelectric Polymers for High‐Performance Perovskite Solar Cells

Application of ferroelectric materials for improving output power of energy harvesters

A Solar Transistor and Photoferroelectric Memory

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