Identifying the functional groups effect on passivating perovskite solar cells

Xie, Jiangsheng; Yan, Keyou; Zhu, Houyu; Li, Guixia; Wang, Han; Zhu, Hepeng; Hang, Pengjie; Zhao, Shenghe; Guo, Wenyue; Ye, Daiqi; Shao, Lei; Guan, Xin; Ngai, To; Yu, Xuegong; Xu, Jianbin

doi:10.1016/j.scib.2020.05.031

Cited by 54 publications

(46 citation statements)

References 49 publications

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“…where a similar V oc trend was observed. Moreover, it is demonstrated that V oc in PSCs tends to increase with the strength of the chemical bonding between perovskite and the deposited molecules 56 , that is similar to our case, in which a higher molecules concentration leads to more significant WF shift.…”

Section: Energy and Environmental Science Accepted Manuscriptsupporting

confidence: 88%

Tuning halide perovskite energy levels

Canil

Cramer

Fraboni

et al. 2021

Energy Environ. Sci.

148

141

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Section: Energy and Environmental Science Accepted Manuscriptsupporting

confidence: 88%

Tuning halide perovskite energy levels

Canil

Cramer

Fraboni

et al. 2021

Energy Environ. Sci.

148

141

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“…The additive molecules containing COOH have been widely demonstrated to control perovskite crystal growth and passivate film defects because carbonyl group as Lewis base in additive molecules can coordinate with Pb 2+ as Lewis acid. [7,[41][42][43] Apart from COOH, carbonyl group was also introduced into additive molecules by amide functional group. [44,45] In addition, it should be stressed that multiple-active-site ligand molecules should be developed to maximize the potentials of defect passivation effect.…”

Section: Introductionmentioning

confidence: 99%

Trap State Passivation by Rational Ligand Molecule Engineering toward Efficient and Stable Perovskite Solar Cells Exceeding 23% Efficiency

Zhu

Zhang

et al. 2021

Advanced Energy Materials

230

220

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long carrier diffusion lengths, adjustable bandgaps, and low-cost fabrication. [1][2][3] Until now, the certified power conversion efficiency (PCE) has reached 25.5%, [4] making the PSC a promising candidate for the next-generation thin-film solar cells. [3,5] However, the presently obtained record PCE is still far from Shockley-Queisser limit efficiency. [6] In addition, the currently achieved stability is much lower below the standard of commercial application. It is well known that poor perovskite film quality is one of the main reasons for efficiency and stability losses. Consequently, it is highly expected to minimize the trap-assisted nonradiative recombination losses via improving perovskite film quality.The traditional solution method with fast crystallization and high-temperature annealing process would inevitably lead to a variety of defects in perovskite bulk and at the surfaces and grain boundaries (GBs). [7][8][9] Most defects in the bulk of perovskite films are shallow-level defects, while most defects at the surface and GBs of perovskite films are deep-level defects, which is detrimental to device performance through capturing carriers. [6,10,11] Moreover, these defects would provide pathways for ion migration, which results in efficiency and stability losses. [6,12,13] In addition, water and oxygen would preferentially attack the surface and GBs of perovskiteThe nonradiative recombination losses resulting from the trap states at the surface and grain boundaries directly hinder the further enhancement of power conversion efficiency (PCE) and stability of perovskite solar cells. Consequently, it is highly desirable to suppress nonradiative recombination through modulating perovskite crystallization and passivating the defects of perovskite films. Here, a simple and effective multifunctional additive engineering strategy is reported where 11 Maleimidoundecanoic acid (11MA) units with carbonyls (carboxyl and amide) and long hydrophobic alkyl chain are incorporated into a perovskite precursor solution. It is revealed that improved crystallinity, reduced trap state density, and inhibited ion migration are achieved, which is ascribed to the strong coordination interaction between the carbonyl groups at both sides of 11MA molecules and Pb 2+ . As a result, improved efficiency and stability are achieved simultaneously after introducing 11MA additive. The device with 11MA additive delivers a champion PCE of 23.34% with negligible hysteresis, which is significantly higher than the 18.24% of the control device. The modified device maintains around 91% of its initial PCE after aging under ambient conditions for 3000 h. This work provides a guide for developing multifunctional additive molecules for the purpose of simultaneous improvement of efficiency and stability.

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“…In this fashion, there is a balance between perovskite defect passivation and charge transfer. Once spincoating the organic BHJ layer onto the perovskite surface, the strong interaction between -C=O group in PCBM and the unsaturated Pb atom can effectively passivate the defect and significantly reduce the trap state density [47]. Along with the increase of the BHJ layer thickness, the surface defects will be minimized owing to the increased interaction site.…”

Section: Articlesmentioning

confidence: 99%

Tailoring organic bulk-heterojunction for charge extraction and spectral absorption in CsPbBr3 perovskite solar cells

Duan

Tang

2020

Sci. China Mater.

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All-inorganic CsPbBr 3 perovskite solar cells (PSCs) are promising candidates to balance the stability and efficiency issues of organic-inorganic hybrid devices. However, the large energy barrier for charge transfer and narrow spectral response are still two challenging problems for performance improvement. We present here an organic bulkheterojunction {poly(3-hexylthiophene-2,5-diyl):[6,6]-phenyl C61 butyric acid methyl ester (P3HT : PCBM)} photoactive layer to boost the charge extraction and to widen the spectral absorption, achieving an enhanced power conversion efficiency up to 8.94% by optimizing the thickness of P3HT: PCBM photoactive layer, which is much higher than 6.28% for the pristine CsPbBr 3 device. The interaction between the carbonyl group in PCBM and unsaturated Pb atom in the perovskite surface can effectively passivate the defects and reduce charge recombination. Furthermore, the coupling effect between PCBM and P3HT widens the spectral response from 540 to 650 nm for an increased short-circuit current density. More importantly, the devices are relatively stable over 75 days upon persistent attack by 70% relative humidity in air condition. These advantages of high efficiency, excellent long-term stability, cost-effectiveness and scalability may promote the commercialization of inorganic PSCs.

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Identifying the functional groups effect on passivating perovskite solar cells

Cited by 54 publications

References 49 publications

Tuning halide perovskite energy levels

Tuning halide perovskite energy levels

Trap State Passivation by Rational Ligand Molecule Engineering toward Efficient and Stable Perovskite Solar Cells Exceeding 23% Efficiency

Tailoring organic bulk-heterojunction for charge extraction and spectral absorption in CsPbBr3 perovskite solar cells

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