Investigation on the role of Lewis bases in the ripening process of perovskite films for highly efficient perovskite solar cells

Zhu, Lifeng; Xu, Yuzuan; Zhang, Pengpeng; Shi, Jiangjian; Zhao, Yue; Zhang, Huiyin; Wu, Jionghua; Luo, Yanhong; Li, Dongmei; Meng, Qingbo

doi:10.1039/c7ta05378a

Cited by 131 publications

(128 citation statements)

References 31 publications

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“…Impressively, the GdF 3 –aminobutanol‐based device displays a PCE of 21.21% with open‐circuit voltage ( V OC ) of 1.17 V, short‐circuit current density ( J SC ) of 23.21 mA cm −2 and fill factor ( FF ) of 0.78. Huang et al revealed a correlation between V OC and grain boundaries, and we also attribute the increasing V OC in GdF 3 –aminobutanol‐based device to the reduction of grain boundaries . Likewise, the larger grain size could efficiently reduce grain boundaries which is beneficial for the suppression of charge carrier recombination, resulting in an increase of FF and J SC …”

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confidence: 54%

Suppressing Vacancy Defects and Grain Boundaries via Ostwald Ripening for High‐Performance and Stable Perovskite Solar Cells

et al. 2019

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As one kind of promising next‐generation photovoltaic devices, perovskite solar cells (PVSCs) have experienced unprecedented rapid growth in device performance over the past few years. However, the practical applications of PVSCs require much improved device long‐term stability and performance, and internal defects and external humidity sensitivity are two key limitation need to be overcome. Here, gadolinium fluoride (GdF3) is added into perovskite precursor as a redox shuttle and growth‐assist; meanwhile, aminobutanol vapor is used for Ostwald ripening in the formation of the perovskite layer. Consequently, a high‐quality perovskite film with large grain size and few grain boundaries is obtained, resulting in the reduction of trap state density and carrier recombination. As a result, a power conversion efficiency of 21.21% is achieved with superior stability and negligible hysteresis.

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confidence: 54%

Suppressing Vacancy Defects and Grain Boundaries via Ostwald Ripening for High‐Performance and Stable Perovskite Solar Cells

et al. 2019

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“…32 Yang and coworkers rst used urea and thiourea as additives for CH 3 -NH 3 (MA)PbI 3 derived normal (ITO/TiO 2 ) PSCs, and demonstrated a PCE of 18.25% using an annealing temperature of 100 C. 10 Meng et al used DMSO/urea to increase the PCE of normal devices up to 20.06% with the perovskites (FAPbI 3 ) 0.75 (MAPbI 3 ) 0.17 (MAPbBr 3 ) 0.08 and urea derived antisolvent washing process. 33 Considering the complexity of perovskite compositions and the myriad fabricating parameters involved in the previous process, we explored the urea and thiourea as simple precursor additives for inverted (MAPbI 3Àx -Cl x and MAPbI 3 ) PSCs. We adopted the ITO/NiO x or PEDOT:PSS/ perovskite/PCBM/Ag structure and found the performance up to 18.8% with little hysteresis for urea-derived devices using a low annealing temperature, as low as 85 C. In particular, the grain size of perovskite can be grown up to 935 nm-which was as twice large as those using conventional method and became a key factor on contributing to the high PCE.…”

Section: +mentioning

confidence: 99%

Low-temperature, simple and efficient preparation of perovskite solar cells using Lewis bases urea and thiourea as additives: stimulating large grain growth and providing a PCE up to 18.8%

et al. 2018

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“…[10] They argued that the Lewis acid-base interaction between the perovskite precursors and the urea might increase the critical Gibbs free energy of nucleation, which decreases the number of nuclei formed. [15] We believed that www.advmat.de www.advancedsciencenews.com urea and/or thiourea could be incorporated as core functional moieties in a newly designed semiconducting chemical additive to increase the size and homogeneity of perovskite grains. [15] We believed that www.advmat.de www.advancedsciencenews.com urea and/or thiourea could be incorporated as core functional moieties in a newly designed semiconducting chemical additive to increase the size and homogeneity of perovskite grains.…”

Section: Doi: 101002/adma201805554mentioning

confidence: 99%

“…This result indicates the existence of SA-1 within the perovskite film with a gradient distribution in the vertical direction in the perovskite layer. However, the details of the nucleation and growth mechanisms (i.e., the effect of the Lewis acid-base interaction on the nucleation and growth kinetics of perovskite crystals) remain unclear; [10,14,15] thus, we are currently performing further mechanistic investigations through combined experimental (e.g., 2D IR spectroscopy) and theoretical methods. The EDS mapping of each element confirmed that the entire device consisted of indium tin oxide (ITO)/hole transport layer (HTL)/perovskite with SA-1/PCBM/ZnO/Ag, respectively.…”

Section: Doi: 101002/adma201805554mentioning

confidence: 99%

Highly Efficient and Stable Inverted Perovskite Solar Cell Obtained via Treatment by Semiconducting Chemical Additive

et al. 2018

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Solar energy is widely regarded as a highly efficient and sustainable source for future energy harvesting. In particular, organicinorganic hybrid perovskite solar cells (PeSCs), which exhibit remarkable power conversion efficiencies (PCEs) exceeding 22% [1] and unique optoelectronic properties, [1c,2] have attracted considerable interest as the most promising materials for large-scale solar energy conversion. [3] In general, the morphology and crystallinity of organic-inorganic halide perovskite films are considered to be crucial to both the efficiency and the stability of PeSCs. [4] Large-sized, highly crystallized, and preferentially oriented perovskite grains provide good surface coverage and a small grain boundary area, which effectively minimize not only the presence of pinholes but also the trapping and recombination of charge carriers. [5] In this respect, considerable effort has been devoted toward preparing high-quality perovskite films with large-sized grains for significantly improving the device performance of PeSCs. [6] Among the various approaches for increasing the perovskite grain size, the addition of chemical additives, such as hypophosphorous acid, [7] methylammonium chloride, [8] 1,8-diiodooctane, [9] urea, [10] and lead thiocyanate (Pb(SCN) 2 ), [11] is widely adopted as it can exploit simple low-temperature processes (typically <150 °C) desirable for effective continuous processing. [12] Although such additive engineering remarkably increases the perovskite grain size to the micrometer scale under extremely mild conditions, the inherent insulating property of the additives prevents the efficient extraction and transport of charge carriers in the perovskite layers, [13] thereby limiting the applicability of this approach.In this paper, we report a semiconducting organic conjugated molecule (SA-1) as a novel chemical additive that increases the grain size of perovskite films without hindering the charge transport and thus improves the device performance considerably (Figure 1a-c). Experimental and analytical investigations revealed that the addition of SA-1 remarkably increased the perovskite grain size through a Lewis acid-base interaction and facilitated charge transport and extraction in the perovskite layer owing to suitable energy level matching and high charge The addition of chemical additives is considered as a promising approach for obtaining high-quality perovskite films under mild conditions, which is essential for both the efficiency and the stability of organic-inorganic hybrid perovskite solar cells (PeSCs). Although such additive engineering yields high-quality films, the inherent insulating property of the chemical additives prevents the efficient transport and extraction of charge carriers, thereby limiting the applicability of this approach. Here, it is shown that organic conjugated molecules having rhodanine moieties (i.e., SA-1 and SA-2) can be used as semiconducting chemical additives that simultaneously yield large-sized perovskite grains and improve the charge extr...

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Investigation on the role of Lewis bases in the ripening process of perovskite films for highly efficient perovskite solar cells

Abstract: The ripening effect of Lewis bases on perovskite films is investigated and PSCs based on a synergistic DMSO/urea system exhibit a PCE of 20.06%.

Cited by 131 publications

References 31 publications

Suppressing Vacancy Defects and Grain Boundaries via Ostwald Ripening for High‐Performance and Stable Perovskite Solar Cells

Suppressing Vacancy Defects and Grain Boundaries via Ostwald Ripening for High‐Performance and Stable Perovskite Solar Cells

Low-temperature, simple and efficient preparation of perovskite solar cells using Lewis bases urea and thiourea as additives: stimulating large grain growth and providing a PCE up to 18.8%

Highly Efficient and Stable Inverted Perovskite Solar Cell Obtained via Treatment by Semiconducting Chemical Additive

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