Solvent modification to suppress halide segregation in mixed halide perovskite solar cells

Li, Yaoyao; Song, Dandan; Meng, Juan; Dong, Jie; Lu, Yunxiang; Huo, Xiaomin; Maqsood, Ayman; Song, Yuhang; Zhao, Suling; Qiao, Bo; Xu, Zheng

doi:10.1007/s10853-020-04697-1

Cited by 8 publications

(10 citation statements)

References 34 publications

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“…Meanwhile, there is also a weak peak in the PL spectra at 745 nm corresponding to Irich phases, indicating that the mixed halide perovskite films suffered from halide segregation. 32,58 We can also observe that the PL intensity of PhABr-doped perovskite films is much lower than that of the control film (Figure S2a), which indicates that PhABr presents minor contribution to the defect passivation due to its short chain length. The PL intensity of perovskite films is obviously increased through PMABr or PEABr doping (Figure S2b,c), indicating that nonradiative recombination is effectively suppressed.…”

Section: Resultsmentioning

confidence: 92%

“…Thus, such low-bandgap regions can compromise the open-circuit voltage ( V OC ) , and the charge-carrier extraction efficiency, , which in turn lower the efficiency and stability of WB-PSCs . It has been found that A-cation alloying is effective to against halide segregation. − Other strategies, such as alloying Cl into the I/Br lattice, modifying the solvents of perovskite precursor, enhancing grain size, , and surface passivation also exhibit a reduced tendency for halide segregation. Though many works have been devoted to addressing the phase segregation issue, it is still a common and major problem for these WB-PSCs. , …”

Section: Introductionmentioning

confidence: 99%

“…25 It has been found that A-cation alloying is effective to against halide segregation. 29−31 Other strategies, such as alloying Cl into the I/Br lattice, 23 modifying the solvents of perovskite precursor, 32 enhancing grain size, 33,34 and surface passivation 35 also exhibit a reduced tendency for halide segregation. Though many works have been devoted to addressing the phase segregation issue, it is still a common and major problem for these WB-PSCs.…”

Section: Introductionmentioning

confidence: 99%

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Suppressed Halide Segregation and Defects in Wide Bandgap Perovskite Solar Cells Enabled by Doping Organic Bromide Salt with Moderate Chain Length

Huo

et al. 2022

J. Phys. Chem. C

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Wide bandgap perovskite solar cells have gained extensive attention due to their complementary absorption to fabricate high performance tandem solar cells with low bandgap absorbers, whereas the open-circuit voltage (V OC) loss caused by halide segregation and defects is one of the main issues hindering their performance. Herein, we report a strategy of adding organic bromide salts with different chain lengths including phenylammonium bromide (PhABr), phenmethylammonium bromide (PMABr) and phenethylammonium bromide (PEABr) into perovskite precursor to suppress the formation of iodide-rich phases and passivate the defects in perovskite films. It is shown that PMABr, which possesses moderate chain length, performs best in improving device performance. The power conversion efficiency (PCE) of 17.32% with enhanced V OC have been achieved, which are much better than these of the standard device (15.72%) and the devices with PhABr (15.98%) or PEABr additives (16.83%). As the chain length is a common variable among different additives, so the results obtained in this work show that it shall be considered in screening the additives.

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Section: Resultsmentioning

confidence: 92%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Suppressed Halide Segregation and Defects in Wide Bandgap Perovskite Solar Cells Enabled by Doping Organic Bromide Salt with Moderate Chain Length

Huo

et al. 2022

J. Phys. Chem. C

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“…NMP has a high hydrogen-bond-accepting ability, which, combined with its more appropriate Lewis base properties, allows the formation of a much more stable FAI●PbI 2 ●NMP adduct compared to DMSO [ 75 ]. The good nucleation of this more stable intermediate and also the rapid detachment of NMP during the annealing step induce the formation of a more uniform and covering film that ultimately cause a great reduction of defects [ 76 , 77 , 78 ]. According to the literature, the use of a small amount of NMP in combination with DMF in FAPbI 3 -based PSCs improved all V OC , J SC , and FF values, thus skyrocketing the efficiency of the devices [ 75 , 76 , 77 , 78 , 79 , 80 , 81 , 82 ].…”

Section: Resultsmentioning

confidence: 99%

Exploring Solar Cells Based on Lead- and Iodide-Deficient Halide Perovskite (d-HP) Thin Films

2023

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Perovskite solar cells have become more and more attractive and competitive. However, their toxicity induced by the presence of lead and their rather low stability hinders their potential and future commercialization. Reducing lead content while improving stability then appears as a major axis of development. In the last years, we have reported a new family of perovskite presenting PbI+ unit vacancies inside the lattice caused by the insertion of big organic cations that do not respect the Goldschmidt tolerance factor: hydroxyethylammonium HO-(CH2)2-NH3+ (HEA+) and thioethylammonium HS-(CH2)2-NH3+ (TEA+). These perovskites, named d-HPs for lead and halide-deficient perovskites, present a 3D perovskite corner-shared Pb1−xI3−x network that can be assimilated to a lead-iodide-deficient MAPbI3 or FAPbI3 network. Here, we propose the chemical engineering of both systems for solar cell optimization. For d-MAPbI3-HEA, the power conversion efficiency (PCE) reached 11.47% while displaying enhanced stability and reduced lead content of 13% compared to MAPbI3. On the other hand, d-FAPbI3-TEA delivered a PCE of 8.33% with astounding perovskite film stability compared to classic α-FAPI. The presence of TEA+ within the lattice impedes α-FAPI degradation into yellow δ-FAPbI3 by direct degradation into inactive Pb(OH)I, thus dramatically slowing the aging of d-FAPbI3-TEA perovskite.

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“…To reduce halide segregation of wide bandgap MHPs, lowering the Br fraction without at the cost of lowering the bandgap is essential. Hence, to suppress the halide segregation and enhance the device performance of MHP based solar cells, [17][18][19][20][21] it is critical to identify the relation between the composition of the perovskites and their bandgaps, and to explore new MHPs with desired bandgaps and low Br fraction.…”

Section: Introductionmentioning

confidence: 99%

Bandgap tuning strategy by cations and halide ions of lead halide perovskites learned from machine learning

Huo

et al. 2021

RSC Adv.

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Solvent modification to suppress halide segregation in mixed halide perovskite solar cells

Cited by 8 publications

References 34 publications

Suppressed Halide Segregation and Defects in Wide Bandgap Perovskite Solar Cells Enabled by Doping Organic Bromide Salt with Moderate Chain Length

Suppressed Halide Segregation and Defects in Wide Bandgap Perovskite Solar Cells Enabled by Doping Organic Bromide Salt with Moderate Chain Length

Exploring Solar Cells Based on Lead- and Iodide-Deficient Halide Perovskite (d-HP) Thin Films

Bandgap tuning strategy by cations and halide ions of lead halide perovskites learned from machine learning

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