Photovoltaic Performance Enhancement of Perovskite Solar Cells Using Polyimide and Polyamic Acid as Additives

Yu, Yang‐Yen; Tseng, Ching Fang; Chien, Wen-Chen; Hsu, Hung-Pin; Chen, Chih‐Ping

doi:10.1021/acs.jpcc.9b05588

Cited by 20 publications

(14 citation statements)

References 26 publications

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“…In addition, highly π-conjugated systems in the HTM molecules and effective dense intermolecular packing can also improve charge transport. Third, the incorporation of Lewis-basic functionalities can passivate defects in the perovskite and, thereby, enhance the performance of PSCs. − …”

Section: Introductionmentioning

confidence: 99%

Dual-Functional Enantiomeric Compounds as Hole-Transporting Materials and Interfacial Layers in Perovskite Solar Cells

Chiu

Kang

et al. 2022

ACS Appl. Mater. Interfaces

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In this paper, we describe the application of the enantiomeric compounds YLC-1−YLC-4, each featuring a bulky spiro[fluorene-9,9′-phenanthren]-10′-one moiety, as both hole-transporting materials (HTMs) and interfacial layers in both n−i−p and p−i−n perovskite solar cells (PSCs). These HTMs contain an enantiomeric mixture and a variety of core units linked to triarylamine donors to extend the degree of π-conjugation. The n−i−p PSCs incorporating YLC-1(a) exhibited a power conversion efficiency (PCE) of 19.15% under AM 1.5G conditions (100 mW cm −2 ); this value was comparable with that obtained using spiro-OMeTAD as the HTM (18.25%). We obtained efficient and stable p−i−n PSCs having the dopant-free structure indium tin oxide (ITO)/NiO x /interfacial layer (YLC)/perovskite/PC 61 BM/BCP/Ag. The presence of the spiro-based compounds YLC-1 and YLC-2 efficiently passivated the interfacial and grain boundary defects of the perovskite and enhanced the sizes of its grains, more so than did YLC-3 and YLC-4. These spiro-based YLC derivatives packed densely and functioned as Lewis bases to coordinate Pb and Ni ions in the perovskite and NiO x layers, respectively. Together, the effects of smaller grain boundaries and defect passivation of the perovskite enhanced the optoelectronic properties of the PSCs. The photoinduced charge carrier extraction in the linearly increasing voltage (photo-CELIV) curves of NiO x /YLC-1(a) showed the faster carrier transport 3.3 × 10 −3 cm 2 V −1 s −1 , which improved the carrier mobility, supporting the notion of defect passivation of the perovskite. The best-performing NiO x /YLC-1(a) device provided a short-circuit current density (J SC ) of 22.88 mA cm −2 , an open-circuit voltage (V OC ) of 1.10 V, and a fill factor (FF) of 80.93%, corresponding to an overall PCE of 20.37%. In addition, the PCEs of the NiO x /YLC-1(a) and NiO x /YLC-4(b) PSC devices underwent decays of only 98.1 and 97.0% of their original values after 41 days under an Ar atmosphere. Thus, these YLC derivatives passivated the NiO x surface and optimized the film quality of perovskites, thereby leading to superior PCEs of their respective PSCs.

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Section: Introductionmentioning

confidence: 99%

Dual-Functional Enantiomeric Compounds as Hole-Transporting Materials and Interfacial Layers in Perovskite Solar Cells

Chiu

Kang

et al. 2022

ACS Appl. Mater. Interfaces

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“…As a result, an increment in the grain size was observed when 0.0497 mg/mL PAA-derived perovskite was employed, illustrating the Lewis acid−base interaction between C=O and Pb 2+ that controls the crystallization process and defect passivation of PVSK. Moreover, both PAA and PI are hydrophobic and highly heat-resistant polymers and further contribute to the stability of PSC when operated in a humid and high-temperature environment [121]. The chemical structure of these additives and their influence on stability are shown in Figures 14 and 15, respectively.…”

Section: Oxygen-based Multifunctional Group Containing Additivesmentioning

confidence: 99%

The Progress of Additive Engineering for CH3NH3PbI3 Photo-Active Layer in the Context of Perovskite Solar Cells

Mangrulkar

Stevenson

2021

Crystals

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Methylammonium lead triiodide (CH3NH3PbI3/MAPbI3) is the most intensively explored perovskite light-absorbing material for hybrid organic–inorganic perovskite photovoltaics due to its unique optoelectronic properties and advantages. This includes tunable bandgap, a higher absorption coefficient than conventional materials used in photovoltaics, ease of manufacturing due to solution processability, and low fabrication costs. In addition, the MAPbI3 absorber layer provides one of the highest open-circuit voltages (Voc), low Voc loss/deficit, and low exciton binding energy, resulting in better charge transport with decent charge carrier mobilities and long diffusion lengths of charge carriers, making it a suitable candidate for photovoltaic applications. Unfortunately, MAPbI3 suffers from poor photochemical stability, which is the main problem to commercialize MAPbI3-based perovskite solar cells (PSCs). However, researchers frequently adopt additive engineering to overcome the issue of poor stability. Therefore, in this review, we have classified additives as organic and inorganic additives. Organic additives are subclassified based on functional groups associated with N/O/S donor atoms; whereas, inorganic additives are subcategorized as metals and non-metal halide salts. Further, we discussed their role and mechanism in terms of improving the performance and stability of MAPbI3-based PSCs. In addition, we scrutinized the additive influence on the morphology and optoelectronic properties to gain a deeper understanding of the crosslinking mechanism into the MAPbI3 framework. Our review aims to help the research community, by providing a glance of the advancement in additive engineering for the MAPbI3 light-absorbing layer, so that new additives can be designed and experimented with to overcome stability challenges. This, in turn, might pave the way for wide scale commercial use.

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“…This V oc loss can be suppressed by passivating the defects present in the perovskite layer. − To enhance the perovskite film quality and reduce trap state, different approaches have been established, such as solvent engineering of precursor solution, development of coating procedure, composition engineering, off-stoichiometric passivation, antisolvent engineering, , utilizing organic molecules in antisolvent, , interface engineering, − and additive engineering. − Among these methods, additive engineering is one of the effective approaches for achieving high-quality perovskite films because of the vast diversity present in their functionality and structure. , D−π–A molecules with −COOH group, phenyl-C61-butyric acid methyl ester (PCBM), and C60-PEG have been added in the antisolvent for defect passivation. , The use of these molecules in antisolvent helps in the passivation of surface defects only. Numerous materials have been investigated as additives in perovskite precursor solution including organic halide salts, metal halide salts, inorganic acids, fullerenes, polymers, and nanoparticles. ,− Many of these additives such as IT-4F, F4TCNQ, PVP (poly(4-vinylpyridine)), polyamic acid and polyimide, fullerene derivatives and ITIC, , organic dye (AQ310), p-type conjugated polymers PBDB-T, and P3HT were able to passivate the defects of perovskite films. Although several approaches have been used, suitable trap state passivation of perovskite films still remains a great challenge due to the complexity and diversity of the surface defects.…”

Section: Introductionmentioning

confidence: 99%

Additive-Assisted Defect Passivation for Minimization of Open-Circuit Voltage Loss and Improved Perovskite Solar Cell Performance

Afroz

Garai

Gupta

et al. 2021

ACS Appl. Energy Mater.

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Trap state formation in perovskite films during their preparation is a key limitation restricting the device performance and stability of perovskite solar cells. These trap states are generally present at the surface of perovskite films and on grain boundaries and work as charge recombination centers, thereby influencing the device performance. Hence, regulating these detrimental trap states that are susceptible to deformation is vital for improving the solar cell performance. Herein, a unique methodology of trap states passivation has been demonstrated using multiple carboxylic acid-functionalized small aromatic molecules. Three additives, viz., benzene carboxylic acid (BCA), benzene-1,3-dicarboxylic acid (BDCA), and benzene-1,3,5-tricarboxylic acid (BTCA), have been utilized as additives in the precursor solution that reduced trap states in the perovskite films. Perovskite films generated in the presence of these additives strongly influence the charge transfer dynamics and result in improved performance and stability of the devices by lowering the photogenerated charge recombination. BTCA-incorporated devices result in the highest power conversion efficiency (PCE) of 18.30% with a significant improvement in the open-circuit voltage (V oc) to 1075.9 mV (an enhancement of ≈80 mV) compared to the control device. Additionally, the devices also show enhanced thermal stability.

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Photovoltaic Performance Enhancement of Perovskite Solar Cells Using Polyimide and Polyamic Acid as Additives

Cited by 20 publications

References 26 publications

Dual-Functional Enantiomeric Compounds as Hole-Transporting Materials and Interfacial Layers in Perovskite Solar Cells

Dual-Functional Enantiomeric Compounds as Hole-Transporting Materials and Interfacial Layers in Perovskite Solar Cells

The Progress of Additive Engineering for CH3NH3PbI3 Photo-Active Layer in the Context of Perovskite Solar Cells

Additive-Assisted Defect Passivation for Minimization of Open-Circuit Voltage Loss and Improved Perovskite Solar Cell Performance

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