Hydrophobic π-conjugated organic small molecule as a multi-functional interface material enables efficient and stable perovskite solar cells

Wang, Runtao; Sun, Tian-Ge; Wu, Tai; Zhu, Zhongqi; Shao, Jiang‐Yang; Zhong, Yu‐Wu; Hua, Yong

doi:10.1016/j.cej.2021.133065

Cited by 17 publications

(14 citation statements)

References 51 publications

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“…[13,33,38] In the past, most of reports primarily focused on investigating and optimizing organic functional groups in Lewis base passivators. Some electron-donating functional groups have been testified to be effective, such as NH 2 , [39] COOH, [33] CO, [40] CS, [33] SO, [41,42] etc. Our group have revealed that using multi-active-site Lewis base ligand molecules can prominently heighten defect passivation effect.…”

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confidence: 99%

Modulating Interfacial Carrier Dynamics via Spatial Conformation toward Efficient and Stable Perovskite Solar Cells

Chen

et al. 2023

Advanced Optical Materials

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Interfacial defects result in serious carrier nonradiative recombination. The correlation between spatial conformation of modifiers and interfacial carrier dynamics is scarcely revealed. Here, an effective interfacial carrier dynamics and defect passivation modulation strategy via controlling spatial conformation of modification molecules is reported. Two kinds of similar Lewis base ligand molecules, biuret (BU) and dithiobiuret (DTBU), are employed to modify the surface of perovskite films. BU and DTBU can effectively passivate interfacial defects but the former is more effective than the latter on account of higher electronegativity and more advantageous molecular spatial arrangement. The planar symmetrical BU molecules can arrange compactly and orderly on the surface of perovskite films while the adsorbed DTBU molecules with a twisted asymmetrical structure are relatively chaotic. BU modification reduces interfacial energy offset, ameliorates improved interfacial energy band alignment, and speeds up hole extraction. In contrast, a much thicker adsorbed layer is yielded after DTBU treatment, which impedes carrier extraction and transfer and accordingly leads to grievous nonradiative recombination. The spatial conformation difference produces an inverse influence on device performance (positive for BU and negative for DTBU). The power conversion efficiency is much enhanced from 21.66% to 23.54% after BU modification along with improved stability.

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confidence: 99%

Modulating Interfacial Carrier Dynamics via Spatial Conformation toward Efficient and Stable Perovskite Solar Cells

Chen

et al. 2023

Advanced Optical Materials

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“…The control and TDCA treated PSCs show a slope value ( α ) of 0.990 and 0.982 (close to 1), respectively, indicating negligible geminated recombination for both devices 36 . Results from the P light versus V oc curves in Figure 1F show that the TDCA‐based device reduces the slope to 1.60 kT/q from 2.03 kT/q for the control sample, which indicates the significant suppression of the defect‐assisted recombination in the TDCA‐doped device 37 . In addition, the interfacial carrier recombination dynamics in device were further investigated by using the transient photovoltage measurement (Figure S6).…”

Section: Resultsmentioning

confidence: 88%

“…36 Results from the P light versus V oc curves in Figure 1F show that the TDCAbased device reduces the slope to 1.60 kT/q from 2.03 kT/q for the control sample, which indicates the significant suppression of the defect-assisted recombination in the TDCA-doped device. 37 In addition, the interfacial carrier recombination dynamics in device were further investigated by using the transient photovoltage measurement (Figure S6). The device treated with TDCA shows a longer decay lifetime of 0.88 s than that based on the control device (0.71 s), implying that the introduction of TDCA into perovskite film shows a lower carrier recombination rate in the device.…”

Section: Resultsmentioning

confidence: 99%

Slowing the hot‐carrier cooling by an organic small molecule in perovskite solar cells

Zhu

Zhao

Zhuang

et al. 2022

EcoMat

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Harvesting hot carriers (HCs) before thermalizing to the perovskite crystal lattice is very promising for advancing the efficiency of perovskite solar cells (PSCs) towards the Shockley-Queisser limit. Thus, it is very crucial to slow down the HCs cooling process in lead halide perovskites. Herein, we investigated the HCs cooling dynamics of perovskite films in the presence of an organic small molecule, 2,5-thiophenedicarboxylic acid (TDCA). We found that adding TDCA into perovskite films can efficiently retard HCs cooling process, which favors extracting the excess energies of HCs through carrier transport layers and reducing electron-hole recombination, resulting in enhanced performance in TDCA modified device. Moreover, TDCA can effectively passivate unsaturated Pb 2+ defects of perovskite films while promoting a preferential crystal orientation. Consequently, the PSCs efficiency is enhanced to 22.85% (TDCA) from 19.96% (control). These findings provide important insight for understanding HCs transfer dynamics and developing nextgeneration perovskite-based HCs optoelectronic devices.

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“…32 Our group also found that incorporating a dipolar interlayer that enhances the built-in electric eld can enhance charge-carrier injection and minimize non-radiative recombination in PSCs. [33][34][35][36] Although attempts through interface engineering have been successfully demonstrated to reduce the defect density, [37][38][39] it has certain limitations in terms of inevitably massive and diverse defects.…”

Section: Introductionmentioning

confidence: 99%

Constructing spike-like energy band alignment at the heterointerface in highly efficient perovskite solar cells

Xie

Wang

et al. 2023

Chem. Sci.

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Hydrophobic π-conjugated organic small molecule as a multi-functional interface material enables efficient and stable perovskite solar cells

Cited by 17 publications

References 51 publications

Modulating Interfacial Carrier Dynamics via Spatial Conformation toward Efficient and Stable Perovskite Solar Cells

Modulating Interfacial Carrier Dynamics via Spatial Conformation toward Efficient and Stable Perovskite Solar Cells

Slowing the hot‐carrier cooling by an organic small molecule in perovskite solar cells

Constructing spike-like energy band alignment at the heterointerface in highly efficient perovskite solar cells

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