Annealing-free perovskite films by instant crystallization for efficient solar cells

Yin, Maoshu; Xie, Fengxian; Chen, Han; Yang, Xudong; Ye, Fei; Bi, Enbing; Wu, Yongzhen; Cai, Molang; Li, Han

doi:10.1039/c6ta02490d

Cited by 110 publications

(70 citation statements)

References 39 publications

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“…We proposed that the strong interaction between PB2T‐SO and PbI 2 may form MAI‐PbI 2 ‐PB2T‐SO complex at GB, which not only results in small grains but also acts as defects to quench excited perovskites, leading to poor performance and severe hysteresis. It coincidentally agree with the previous work reported that the residue DMSO in perovskite film could decrease device efficiency . We further measured the dark current of three HEMs based devices (Figure S10, Supporting Information).…”

Section: Introductionsupporting

confidence: 91%

Modulate Molecular Interaction between Hole Extraction Polymers and Lead Ions toward Hysteresis‐Free and Efficient Perovskite Solar Cells

Zhang

Ding

et al. 2018

Adv Materials Inter

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Herein three polymeric hole extraction materials (HEMs), poly(benzene‐dithiophene) (PB2T)‐O, PB2T‐S, and PB2T‐SO are presented for p–i–n perovskite solar cells (PVSCs). This study reveals that the perovskite device hysteresis and performance heavily rely on the perovskite grain boundary conditions. More specifically, they are predetermined through the molecular interaction between Lewis base atoms of HEMs and perovskites. It is revealed that only changing the side chain terminals (OCH3, SCH3, and SOCH3) of HEMs results in effective modulating PVSC performance and hysteresis, due to the effective tune of interaction strength between HEM and perovskite. With an in situ grown perovskite‐HEM bulk heterojunction structure, PB2T‐O with weak binding group (OCH3, −78.9 kcal mol−1 bonding energy) to lead ions allows delivering hysteresis‐free and efficient devices, which is sharp contrast to the strong binding PB2T‐SO (−119.3 kcal mol−1 bonding energy). Overall, this work provides new insights on PVSC hysteresis and the related curing methods via multifunctional HEM design in PVSCs.

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Section: Introductionsupporting

confidence: 91%

Modulate Molecular Interaction between Hole Extraction Polymers and Lead Ions toward Hysteresis‐Free and Efficient Perovskite Solar Cells

Zhang

Ding

et al. 2018

Adv Materials Inter

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“…Although, interesting attempts to form perovskite crystal without thermal annealing were carried out in recent years, film quality and device performance of state of the art devices are still largely relying on this approach. [113,114] The manipulation of process variables, including annealing temperature, duration time, temperature rise profile and substrate preheating offers an opportunity to optimize perovskite thin-film by controlling crystalline nucleation and growth kinetics. Summary of the performance of perovskite solar cells based on various crystallization methods is presented in Table 3.…”

Section: Heat Treatmentmentioning

confidence: 99%

Hybrid Perovskites: Effective Crystal Growth for Optoelectronic Applications

Jeon

Kim

Yoon

et al. 2017

Advanced Energy Materials

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Outstanding material properties of organic-inorganic hybrid perovskites have triggered a new research insight into the next-generation solar cells. Moreover, a wide range of controllable properties of hybrid perovskites particularly depending on crystal growth conditions enables versatile high performance optoelectronic devices such as light-emitting diodes, photodetectors and lasers beyond solar cells. This invited review article highlights recent progress of the crystallization strategies of organic-inorganic hybrid perovskites for effective light harvester or light emitter. In the first part, fundamental background on the perovskite crystalline structures and relevant optoelectronic properties such as optical band-gap, electron-hole behavior and energy band alignment are introduced. In the second part, detailed overview of the effective crystallization methods for perovskites, including thermal treatment, additives, solvent mediator, laser irradiation, nanostructure, crystal dimensionality and so on, is described to offer a comprehensive correlation among perovskite processing conditions, crystalline morphology and relevant device performances. Finally, future research direction is proposed to overcome current practical bottlenecks and move towards reliable high performance perovskite optoelectronic applications.3

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“…Recently, there are several reports appeared on cation combinations such as FA and Cs and/or MA perovskite formulations to yield black photoactive perovskite phase without annealing [8,9] . PSCs have been prepare at RT with efficiency of 15-17% [10,11] . However this method involves replacing the high boiling point dimethyl formamide (DMF) or dimethyl sulfoxide (DMSO) by a volatile solvent, which is not attractive from the practical point of view.…”

mentioning

confidence: 99%

Room‐Temperature Formation of Highly Crystalline Multication Perovskites for Efficient, Low‐Cost Solar Cells

et al. 2017

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Lead halide APbX3 based perovskite solar cells (PSCs) continue to attract large attention exhibiting currently a certified efficiency of 22.1% [1] , exceeding that of commercial polycrystalline silicon solar cells [2] . This has prompted recent strong interest in the development of PSCs for large-scale practical deployment. Since PSCs can be manufactured by solution methods, judicious process design is of primary concern for commercialization, targeting especially lower cost methods compared with other solar cells. However, state of the art perovskite materials such as MAPbI3 or FAPbI3 (where MA is methylammonium, CH3NH3 + and FA is formamidinium. CH2(NH2)2 + ) that are mostly used for PSCs need annealing at 70-150°C for 30-60 minutes to form the black crystalline photoactive layer [3][4][5] .This process is not suitable for mass production. Considering the roll-to-roll fabrication that is a very attractive way for mass production, the 30-60 minutes annealing process not only decreases throughput but also requires large processing areas and annealing equipment, apart from consuming energy. One way to address this problem is to employ an instant flash annealing technique as reported by J.Troughton et al. who used NIR heating or photonic flash sintering [6,7] .

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Annealing-free perovskite films by instant crystallization for efficient solar cells

Abstract: Ethyl acetate (EA) is introduced in a one-step spin-coating method and can induce instant crystallization of perovskite films to create efficient thermal annealing-free perovskite solar cells.

Cited by 110 publications

References 39 publications

Modulate Molecular Interaction between Hole Extraction Polymers and Lead Ions toward Hysteresis‐Free and Efficient Perovskite Solar Cells

Modulate Molecular Interaction between Hole Extraction Polymers and Lead Ions toward Hysteresis‐Free and Efficient Perovskite Solar Cells

Hybrid Perovskites: Effective Crystal Growth for Optoelectronic Applications

Room‐Temperature Formation of Highly Crystalline Multication Perovskites for Efficient, Low‐Cost Solar Cells

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