Stable Inverted Planar Perovskite Solar Cells with Low‐Temperature‐Processed Hole‐Transport Bilayer

Zhou, Zhongmin; Li, Xing; Cai, Molang; Xie, Fengxian; Wu, Yongzhen; Lan, Zhang; Yang, Xudong; Ye, Qiang; Islam, Ashraful; Li, Han

doi:10.1002/aenm.201700763

Cited by 122 publications

(87 citation statements)

References 28 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…According to the selective contact used on the bottom, the PSCs can be divided into two main configurations: n‐i‐p (regular) and p‐i‐n (inverted) architectures. As it is well known, the inverted planar PSCs have the potential application in roll‐to‐roll production due to the advantages of relative low‐temperature, solution‐process and flexibility . Poly(3,4‐ethylenedioxythiophene): poly(styrene sulfonate) (PEDOT:PSS) is one popular material used as underlayer to perovskite film deposition due to the simple water solution‐process.…”

Section: Introductionmentioning

confidence: 99%

Environmental‐Friendly Urea Additive Induced Large Perovskite Grains for High Performance Inverted Solar Cells

et al. 2018

View full text Add to dashboard Cite

It is a challenge to grow perovskite films with large crystalline grains and a full coverage on the surface of an organic compound film by a solution process. Herein, we for the first time introduce environmental‐friendly urea into PbI2 precursor to mediate the perovskite film growth and crystallization on the top of PEODT:PSS for efficient inverted solar cells. This method attains high‐quality perovskite films with large‐size grains of over 2 μm and a full coverage. This enables us to fabricate the inverted perovskite solar cells showing a maximum efficiency of 18.01% with a fill factor of 82.29% and a stabilized efficiency of 17.56%. Infrared spectroscopy and scanning electron microscopy images demonstrate that urea is coordinated with PbI2 to form PbI2 · OC(NH2)2 complex, resulting in large PbI2 flakes by a slow crystallization. The large PbI2 flake with fewer nucleation sites is conducive to forming monolithic perovskite grains. Further investigation indicates that CH3NH3I · PbI2 · OC(NH2)2 complex is formed as an intermediate phase, which retards the crystallization process of the perovskite films. These factors lead to a high‐quality perovskite film with large grain size and excellent crystallinity.

show abstract

Section: Introductionmentioning

confidence: 99%

Environmental‐Friendly Urea Additive Induced Large Perovskite Grains for High Performance Inverted Solar Cells

et al. 2018

View full text Add to dashboard Cite

show abstract

“…To eliminate such losses, an additional layer of a material with a high ionization potential is typically added at the fullerene/cathode interface and is termed a 'hole-blocking layer'. The positive effect on the fill factor of devices has been shown for many HBLs, including metal acetylacetonate [27], LiF [28], titanium (diisopropoxide) bis (2, 4-pentanedionate) [29], and perylene−diimide [30], yet one of the most commonly employed HBLs remains bathocuproine (BCP) due to its ease of fabrication and relative stability [31][32][33]. Most HBLs have little to no effect on the V OC of the devices, especially in the case of PEDOT:PSS as a HTL.…”

Section: Introductionmentioning

confidence: 99%

Dipolar hole-blocking layers for inverted perovskite solar cells: effects of aggregation and electron transport levels

Butscher

Sun

et al. 2020

J. Phys. Mater.

View full text Add to dashboard Cite

Herein, we report on the synthesis and investigation of two triazino-isoquinoline tetrafluoroborate electrolytes as hole-blocking layers in methylammonium triiodide perovskite photovoltaic devices with fullerene electron extraction layer. We find that increasing the thickness of the dipolar holeblocking layer results in a gradual increase in the open-circuit voltage suggesting that aggregation of the molecules can enhance the dipole induced by the layer. This finding is confirmed by theoretical calculations demonstrating that while both molecules exhibit a similar dipole moment in their isolated state, this dipole is significantly enhanced when they aggregate. Ultra-violet photoemission spectroscopy measurements show that both derivatives exhibit a high ionization potential of 7 eV, in agreement with their effective hole-blocking nature demonstrated by the devices. However, each of the molecules shows a different electron affinity due to the increased conjugation of one of the derivatives. While the change in electron transport level between the two derivatives is as high as 0.3 eV, the difference in the open-circuit voltage of both types of devices is negligible, suggesting that the electron transport level plays only a minor role in determining the open-circuit voltage of the device. Numerical device simulations confirm that the increase in built-in potential, arising from the high dipole of the electrolyte layer, compensates for the non-ideal energetic alignment of the charge transport levels, resulting in high open-circuit voltages for a range of electron transport levels. Our study demonstrates that the application of small molecule electrolytes as hole-blocking layer in inverted architecture perovskite solar cells is a powerful tool to enhance the open-circuit voltage and provides useful guidelines for designing future generations of such compounds.

show abstract

“…Alternatively, the inverted structure with organic hole transport layers (HTLs) is a good choice, because the temperature of entire fabrication, except for evaporation process, is usually not beyond 150 °C . However, the performance of inverted devices is normally lower than that of the mesoporous devices . To improve the performance of inverted PSCs, lots of work have been carried out, such as fabrication techniques optimization and interfacial engineering .…”

mentioning

confidence: 99%

Polymer Assisted Small Molecule Hole Transport Layers Toward Highly Efficient Inverted Perovskite Solar Cells

Liu

et al. 2018

Solar RRL

View full text Add to dashboard Cite

In this paper, inverted perovskite solar cells (PSCs) employing a novel polymer‐assisted small molecule layer as hole transport layer (HTL) are reported and the effect of mixed HTL on the device performance is investigated. It is the first time that the small molecule HTL is doped with a polymer HTL. The introduction of appropriate content of polymer into the small molecule layer will lead to a much smoother surface for the mixed HTL and largely reduced charge recombination, and most importantly, the energy level alignment is more matched with that of the perovskite via optimization of the doping content. Therefore, the hole transfer property is largely improved for the perovskite/mixed HTL composites. After the optimization of the polymer content in the mixed HTLs, an average power conversion efficiency (PCE) of 19.03 ± 0.53% is achieved, and the champion device exhibits a PCE of >21%. This work provides an effective strategy for the development of highly efficient inverted PSCs based on small molecule HTLs.

show abstract

Stable Inverted Planar Perovskite Solar Cells with Low‐Temperature‐Processed Hole‐Transport Bilayer

Cited by 122 publications

References 28 publications

Environmental‐Friendly Urea Additive Induced Large Perovskite Grains for High Performance Inverted Solar Cells

Environmental‐Friendly Urea Additive Induced Large Perovskite Grains for High Performance Inverted Solar Cells

Dipolar hole-blocking layers for inverted perovskite solar cells: effects of aggregation and electron transport levels

Polymer Assisted Small Molecule Hole Transport Layers Toward Highly Efficient Inverted Perovskite Solar Cells

Contact Info

Product

Resources

About