Simple furan-based polymers with the self-healing function enable efficient eco-friendly organic solar cells with high stability

ACS Appl. Mater. Interfaces

et al. 2022

Self Cite

Perovskite solar cells (PSCs) have been regarded as an exceptional renewable energy conversion technology due to their rapidly increasing photovoltaic efficiency, while their practical application is highly retarded by their intrinsic instability and potential lead ion leakage. Here, a two-dimensional (2D) π-conjugated benzodifuran-based polymer, PBDFP-Bz, is adopted to modify the perovskite film. Note that PBDFP-Bz could neutralize surface defects, fine-tune interfacial energetics, and hamper moisture ingression into the perovskite film. Therefore, high-quality perovskite films featuring reduced trap state density and enhanced moisture tolerance could be obtained after modification via PBDFP-Bz. Consequently, PBDFP-Bz-modified devices deliver a higher efficiency of 21.73% versus 19.55% of control ones. Meanwhile, PBDFP-Bz-modified devices can preserve 82.7 and 90.8% of their initial efficiency under continuous heating at 85 °C or light soaking for 500 h. However, the corresponding retained values of control devices are only 56.4 and 70.2%, respectively. Moreover, PBDFP-Bz can effectively prevent the leakage of lead ions in modified devices relative to control ones. This work not only reveals that PBDFP-Bz features high potential for fabricating high-performance and robust PSCs but also indicates that 2D π-conjugated benzodifuran-based polymers can endow PSCs with great security for sustainable development without the concern of lead ion leakage.

Section: Results and Discussionsupporting

confidence: 86%

Multifunctional Two-Dimensional Benzodifuran-Based Polymer for Eco-Friendly Perovskite Solar Cells Featuring High Stability

ACS Appl. Mater. Interfaces

et al. 2022

Self Cite

“…Generally, the relationship between J sc and P light can be described as a power-law equation, J sc ∝ P light α , in which bimolecular charge recombination loss of devices could be negligible if the exponent α is close to unity. ,− Obviously, the logarithmic plots between J sc and P light depict a slope of 0.965 and 0.936 for devices based on the Ti 3 C 2 T x /TiO 2 photoanode and TiO 2 photoanode (Figure a), respectively, in which the larger slope of the former demonstrates that their bimolecular charge recombination is relatively suppressed. Beyond that, the slope of V oc against the natural logarithm of P light can be used to disclose different charge carrier recombination behaviors, where the deviation in slope approaching kT/e indicates that the recombination mechanism in devices is dominated by bimolecular charge recombination, but the trap-assisted recombination would dominate in the device if the deviation in the slope is close to 2kT/e. − As exhibited in Figure b, the devices based on the Ti 3 C 2 T x /TiO 2 photoanode deliver a relatively smaller slope of 1.36 than control ones (1.77), implying that the trap-assisted charge recombination is highly prohibited in the former.…”

Section: Resultsmentioning

confidence: 99%

Holistically Optimizing Charge Carrier Dynamics Enables High-Performance Dye-Sensitized Solar Cells and Photodetectors

Lan

ACS Appl. Mater. Interfaces

et al. 2022

Self Cite

Charge carrier events across organic electronics are ubiquitous, and the derived optimization plays a crucial effect on improving the performance of organic electronics. Herein, a two-dimensional material (Ti3C2T x ) is incorporated into titanium dioxide (TiO2) to impart the Ti3C2T x /TiO2 hybrid film enriched hydroxy group distribution, defect-negligible surface, upshifted work function, and enhanced conductivity yet electron mobility versus the pristine TiO2 film. Therefore, intensified photon-harvesting ability, reduced charge carrier recombination, and efficient charge carrier collection are realized for dye-sensitized solar cells (DSSCs) based on the Ti3C2T x /TiO2 hybrid photoanode relative to control ones. Consequently, the modified DSSCs based on Z907 deliver superior efficiencies of 10.39 and 29.68% under 100 mW/cm2 illumination and ∼1.9 mW/cm2 dim light, respectively, being the highest values of Z907-based DSSCs. However, control devices only obtain lower efficiencies of 8.06 and 23.91% when undergoing the abovementioned illumination. On the other hand, the self-powered homologous photodetectors with the hybrid film as an electron-transporting layer present enhanced detectivity (1.69 × 1011 Jones) and a shortened responsivity of 0.26 s versus that of control ones (1.39 × 1011 Jones and 0.35 s). Our work implies that the Ti3C2T x /TiO2 hybrid film features high potential for improving the performance of organic electronics for its effect of holistically optimizing charge carrier dynamics.

“…Finally, the target polymer PFO with a yield of 81.7% was prepared via Pd‐catalyzed Stille coupling reaction between compound 2 and compound 3, where the latter was synthesized according to our previous work. [ 26 ] The number‐average molecular weight ( M n ) and polydispersity index (PDI) of PFO are 12.1 kDa and 2.02 (Figure S1, Supporting Information), respectively, which are obtained via gel permeation chromatography (GPC). Besides, PFO displays intense and broad peak in the region of 3400–3500 cm −1 with maximum absorption peak locating at 3433 cm −1 (Figure S2, Supporting Information), which should be ascribed to the intermolecular hydrogen bonds of PFO according to our previous work.…”

Section: Resultsmentioning

confidence: 99%

“…Besides, PFO displays intense and broad peak in the region of 3400–3500 cm −1 with maximum absorption peak locating at 3433 cm −1 (Figure S2, Supporting Information), which should be ascribed to the intermolecular hydrogen bonds of PFO according to our previous work. [ 26 ] It is noted that PFO was synthesized via merely three‐step procedures, which all displayed high yield of exceeding 80%. The shortened synthetic procedures and high production yield enable low material cost of 28.44 $ g −1 for PFO (Table S1,S2, Supporting Information), which is extremely lower than those fused‐ring copolymers and highlights its great potential for large‐scale cost‐effective production.…”

Section: Resultsmentioning

confidence: 99%

Ethanol‐Processable Polyfuran Derivative for Eco‐Friendly Fabrication of Organic Solar Cells Featuring Self‐Healing Function

Shang

et al. 2022

Solar RRL

Self Cite

Over the last decades, organic solar cells (OSCs) have drawn tremendous research interest in academy and industry due to their intrinsic characteristics, i.e., facile solution processing engineering, chemical versatility of photovoltaic materials, rapid energy payback time, and so on. [1][2][3][4] Along with remorseless efforts paid to developing high-performance photovoltaic materials and innovating device engineering, OSCs can even rival with other established thin film photovoltaics in terms of the device efficiency. [5][6][7][8][9][10] More importantly, OSCs exhibit great potential application as indoor photovoltaics for their high efficiency, lightweight, and good flexibility. [11,12] Even though great progress has been achieved for OSCs in laboratory, there are still some critical issues that should be overcome for prompting their commercialization, i.e., material cost, eco-friendly processing, and device stability.Up to now, most of those reported high-performance photovoltaic materials are composed of fused-ring building blocks, which are always prepared via tedious and harsh synthetic processes, inevitably resulting in large production cost (>1000 $ g À1 ). [13][14][15] Obviously, it is unrealistic to realize cost-effective mass production of OSCs based on those fused-ring photovoltaic materials. Besides, high-performance OSCs almost adopted toxic organic solvents to fabricate, such as chloroform, toluene, chlorobenzene, and so on. [16,17] It is worth pointing out that those toxic organic solvents for OSCs are strictly inhibited in majority of countries for their seriously harmful feature to human health and ambient environment. [18,19] Furthermore, high cost and plenty of input energy are inevitably needed to produce, store, and dispose those toxic organic solvents, which would insert an additional burden for large-scale production of OSCs. [20,21] In addition to the abovementioned aspects, those high-performance photovoltaic materials are prone to irreversibly photodegrade especially for those emerging nonfullerene electron acceptor materials possessing fragile alkene group (C═C), which would greatly undermine the device stability. [22][23][24][25] Therefore, it is full of significance and challenge to rationally design photovoltaic materials to fulfill the criterions of ideal OSCs featuring low-cost, environmentally benign, and stable characteristics for the civilian application.