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Tabassum, M.;  Zia, Q.;  Zhou, Y.;  Wang, Y.;  Reece, M.J.;  Su, L. Textile-Based Perovskite Optoelectronic Applications. Encyclopedia. Available online: https://encyclopedia.pub/entry/26621 (accessed on 07 July 2024).
Tabassum M,  Zia Q,  Zhou Y,  Wang Y,  Reece MJ,  Su L. Textile-Based Perovskite Optoelectronic Applications. Encyclopedia. Available at: https://encyclopedia.pub/entry/26621. Accessed July 07, 2024.
Tabassum, Madeeha, Qasim Zia, Yongfeng Zhou, Yufei Wang, Michael J. Reece, Lei Su. "Textile-Based Perovskite Optoelectronic Applications" Encyclopedia, https://encyclopedia.pub/entry/26621 (accessed July 07, 2024).
Tabassum, M.,  Zia, Q.,  Zhou, Y.,  Wang, Y.,  Reece, M.J., & Su, L. (2022, August 29). Textile-Based Perovskite Optoelectronic Applications. In Encyclopedia. https://encyclopedia.pub/entry/26621
Tabassum, Madeeha, et al. "Textile-Based Perovskite Optoelectronic Applications." Encyclopedia. Web. 29 August, 2022.
Textile-Based Perovskite Optoelectronic Applications
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This entry is adapted from the peer-reviewed paper 10.3390/textiles2030025

Metal halide perovskites (MHPs) are thought to be among the most promising materials for smart electronic textiles because of their unique optical and electrical characteristics. Wearable perovskite devices have been developed that combine the excellent properties of perovskite with those of textiles, such as flexibility, light weight, and facile processability. 

perovskite flexible substrate textile optoelectronics

1. Wearable Solar Cells

Textile-based flexible perovskite solar cells have long been a question of great interest because of their unique properties, such as high flexibility, wearability, and ability to conform to any shape. Compared with conventional rigid solar cells, wearable perovskite solar cells can be easily deployed on curved or irregular surfaces of vehicles or tents. The wearability of PSCs mainly depends on the flexibility of the substrates, which defines not only the final efficiency, but also the mechanical and environmental stability. Furthermore, charge-transport layers (HTLs/ETLs) must have better stability against chemicals, oxygen, and water vapour to prevent corrosion and degradation [1][2][3].
The low-temperature synthesis of charge-transport layers and high-quality perovskite films is necessary to produce high-efficiency wearable perovskite solar cells. As mesoporous structure (e.g., TiO2 as the ETL) always demands high-temperature arrangements (≈500 °C), which are not suitable for flexible substrates, there are only a few scientific reports about the application of this architecture in this field [4][5][6]. Therefore the advancement in textile-based flexible perovskite solar cells is mostly reported in regular (n-i-p) or inverted (p-i-n) structures [7][8][9].
The first flexible perovskite solar cell was structured using ZnO nanorods as a mesoscopic scaffold layer and an ETL to allow the fabrication of low-temperature solution-based perovskite CH3NH3PbI3 solar cells. A PCE of 8.90% and 2.62% was recorded for rigid fluorine tin oxide (FTO) and flexible PET/ITO substrates, respectively [10]. Sisi et al. reported another effective strategy for the fabrication of textile-based PSCs by synthesising obelisk-like ZnO arrays on stainless steel fabric via a mild solution process. The perovskite CH3NH3PbI3 thin layer was formed by the dip-coating process, and the resulting solar cells showed a PCE of 3.3%, with only 7% variation after bending for 200 cycles [11].
A novel stainless steel fibre-shaped PSC with high flexibility and low cost was developed by continuously winding carbon nanotubes on a fibre substrate. Photoactive perovskite CH3NH3PbI3 was sandwiched in between them via the solution-processing technique, and the fibre-shaped PSC showed a PCE of 3.3%. The fibre-shaped PSC can be woven into smart textiles for large-scale applications [12].
A recent study to develop a novel fibre-based solar cell textile that works at −40 °C to 160 °C was reported by Limin et al. Briefly, a family of inorganic perovskite solar cell fibres and textiles were made by multiple-sintering techniques to fully cover the curved surface of fibre substrate with large, uniform perovskite crystals. Firstly, CsPbBr3 quantum dots (QDs) were fabricated by a room-temperature ligand-assisted method. Then aligned TiO2 nanotubes were successfully grown on Ti wire and dipped into inorganic perovskite QDs to form a uniform layer on the fibre substrate.
After that, a solar cell textile was used to power an electronic watch worn by a human. In addition, it could also work under harsh working conditions, such as being frozen in ice or placed on red-hot charcoal [13]. The most recent studies available on textile-based perovskite photovoltaic applications are summarised in Table 1.
Table 1. Summary of the textile-based perovskite solar cells’ performance a.
Textile Substrate Perovskite
Photoactive Layer		 Fabrication
Method		 VOC
(V)		 Jsc
(mA/cm2)		 FF
(%)		 PCE
(%)		 Ref.
Polyester fabric CH3NH3PbI3 Bar coating 0.88 12.44 49 5.72 [14]
Stainless steel fabric CH3NH3PbI3 Dip coating 0.55 3.72 - 3.80 [11]
Stainless steel fibre CH3NH3PbI3 Dip coating 0.66 10.20 48 3.30 [12]
PAN/PU fabric CH3NH3PbI3 Spin coating 0.80 8.86 57 4.06 [15]
TiO2 modified Ti-fibre CsPbBr3 Dip coating 1.19 6.48 70 5.37 [13]
Acrylic elastomer CH3NH3PbI3 Spin coating 1.06 17.05 65 14.80 [16]
Carbon fabric CsMAFAPbI3 − xBrx Spin coating 1.12 20.42 67 15.29 [17]
PEN CH3NH3PbI3 − xClx Spin coating 0.96 19.06 59 12.20 [18]
Carbon fibre CH3NH3PbI3 − xClx Dip coating 0.61 8.75 56 3.03 [19]
Polyester fabric (FAPbI3)0.85(MAPbBr3)0.15 Spin coating 1.09 22.41 72 17.68 [19]
a Abbreviations: Ti = titanium; PAN/PU = poly(acrylonitrile)/polyurethane; TiO2 = titanium dioxide.
Jung et al. performed a series of experiments on fully solution-processed perovskite (CH3NH3PbI3) solar cells fabricated on PU-coated polyester fabric. A thin layer of PU was coated as a planarisation layer that effectively improved the wettability, processability, and surface morphology of the textile surface. The textile-based flexible PSCs were successfully fabricated, and PCE of 5.72% was achieved by using solution-processed anode, HTL, and ETL materials [14]. In another textile-based PSC report, low-temperature tin oxide (SnO2) ETL, perovskite (CH3NH3PbI3), and a novel encapsulation layer were obtained. An ITO/PEN flexible substrate was chosen to fabricate the most efficient textile-based PSC with improved wash capability and ambient stability. A 15% PCE of this unique textile-based PSC was recorded, with future potential in wearable device applications [16].
In the development of wearable power sources, highly flexible, lightweight, efficient PSCs based on PEN/ITO substrates with a PCE of 12.2% have been reported. In addition, bending stability was recorded for solar devices with three effective bending radii of 400 mm, 10 mm, and 4 mm for the human neck, wrist, and finger, respectively. In the case of a human finger, the PCE significantly dropped to 50% of the initial value after 1000 cycles. It was noted that the origin of degradation was due to the fracture in the ITO layer on the PEN substrate [18].

2. Photodetectors for Wearable Optoelectronics

Textile-based photodetectors (PDs) are a major area of interest within the fields of video imaging, bioinspired sensing, optical communication, and biomedical imaging. In recent years, wearable PDs have been fabricated on a variety of flexible substrates because of their possible applications in touchscreens, wearable electronic devices, and pressure-induced sensing [20]. Several key factors define the final efficiency of wearable PDs, such as the morphology of substrates, and the retention of initial performance values after repeated bending, stretching, or folding. Therefore, the main components of wearable PDs—such as substrates, charge-transport layers, and electrodes—should be stable enough to resist environmental and mechanical hazards. In addition, MHPs can be easily synthesised by low-temperature solution-processing techniques, which is helpful in making wearable PDs [21][22][23].
Dong et al. reported highly flexible fibrous yarn bundles and their knitted structure as a template to fabricate MAPbI3-based PDs. They fabricated quasi-spring-like network-based wearable PDs consisting of silver (Ag) electrode/perovskite (MAPbI3)/yarn bundles, and their photoelectric properties were examined.
Poly (vinylidene fluoride) (PVDF)-based flexible and self-powered PDs were fabricated that use a mixed-cation perovskite (FAPbI3)1−x (MAPbBr3)x as the photoactive material. These wearable PDs have the advantages of light weight, low cost, and the ability to reshape in any form for the human body without any physical restrictions. The synthesised PDs showed good performance, with a fast response speed (trise = 82 ms, tdecay = 64 ms) and high detectivity (7.21 × 1010 jones at zero bias) under 254 UV illumination, and excellent mechanical stability at some bending angles [24]. In another study, PVDF was reported as a flexible substrate to integrate CsPbBr3 nanosheets into ZnO nanowires and graphene. The resultant p–n junction due to ZnO and CsPbBr3 can facilitate the enhanced transportation of photogenerated charge carriers, leading to a high Ilight/Idark ratio of ~103. The flexible thin-film PDs can be easily attached to human skin for wearable applications [25].
Polymer/perovskite composite nanofibers were prepared by the electrospinning technique to demonstrate their potential for stretchable and wearable PDs. The poly (vinylpyrrolidone)/MAPBI3 nanofibrous membranes showed the ability to endure 15% strain, and started to break at 20% strain. At 15% strain, the detectivity and photoresponsivity of the wearable PDs at λ = 550 nm were 51.2 mWA−1 and 2.23 × 1011 jones, respectively [26].

3. Fibre- and Fabric-Based Perovskite Light-Emitting Diodes

Alongside the development of PSCs, perovskite LEDs (PeLEDs) have exciting potential to be the first next-generation LEDs based on their excellent electro-optical properties. Since the first demonstration of PeLEDs incorporating 3D perovskite in 2014, intense efforts have been dedicated to developing high-performance PeLEDs [27][28]. As they have shown good performance on rigid substrates, the next important direction for PeLEDs is their integration with textile-based optoelectronics for wearable applications. Wearable LEDs can meet the requirements of lightweight and portable electronic devices. For wearable LEDs, tremendous efforts have been reported for preparing different components of PeLEDs, such as flexible electrodes and HTLs/ETLs.
A recent study by Shan and Wei involved a hybrid strategy to fabricate wearable and tuneable perovskite quantum-dot-based light-emitting/detecting bifunctional fibres. In this method, a transparent PET fibre coated with PEDOT:PSS was used as a working electrode for the synthesis of flexible electroluminescent (EL) fibres. 
Jiang et al. demonstrated stretchable touch-responsive PeLEDs by using a highly conductive and transparent polyurethane (PU)/Ag nanowire composite electrode. Moreover, a stretchable perovskite active layer was synthesised by mixing poly (vinylpyrrolidone) and poly (ethylene oxide) with CsPbBr3. When the pressure was applied to the PU/Ag, a connection between the electrode and the perovskite layer allowed electrons and holes to recombine when voltage was applied. As the pressure was released, the PU/Ag electrodes disconnected from the emissive layer and returned to their original position. The device exhibited a luminance of 380.5 cd/m2 at 7.5 V, with good touch responsivity after 315 cycles. In addition, the fabricated device showed a certain stretchability before 40 stretching cycles.  .
A significant discussion of the influence of solvent trapped in ITO/PEN substrates on the efficiency of flexible PeLEDs was presented by Kim et al. In device fabrication, cleaning and ultraviolet–ozone treatment are considered important for uniform perovskite deposition. However, the trapped solvents can easily generate radicals that are adsorbed on the ITO surface. This leads to effects on the sheet resistance and Fermi level. The complete removal of solvents helps to enhance the luminance from 87.2 cd/m2 to 329.6 cd/m2 at 4 V [29]. Some researchers also highlight the importance of monolayered graphene for flexible photonic applications. This unique material can be used as an anode for flexible LEDs due to its high light transparency and theoretical resistance (>6.4 k Ω/sq) [30].
To solve the intrinsic instability and crystal friability of MHPs, a facile approach using liquid-to-liquid encapsulation inkjet printing was presented. Perovskite inks were directly inkjet-printed into the liquid PDMS to synthesise the single-crystal embedded PDMS structures in situ. The space-confined effect of liquid PDMS is the key to producing single-crystal arrays in PDMS, which can effectively control the crystallisation process and help to form the single-crystal perovskite structures. This technique can lead to the scalable formation of air-stable single-crystal perovskite structures for wearable light-emitting devices [31].

References

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Subjects: Engineering, Electrical & Electronic
Contributors MDPI registered users' name will be linked to their SciProfiles pages. To register with us, please refer to https://encyclopedia.pub/register :
Madeeha Tabassum
,
Qasim Zia
,
Yongfeng Zhou
,
Yufei Wang
,
Michael J. Reece
,
Lei Su
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Revisions: 3 times (View History)
Update Date: 05 Sep 2022
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