Binary hole transport materials blending to linearly tune HOMO level for high efficiency and stable perovskite solar cells

Yin, Xinxing; Wang, Changlei; Zhao, Dewei; Shrestha, Niraj; Grice, Corey R.; Guan, Lei; Song, Zhaoning; Chen, Cong; Li, Chongwen; Chi, Guoli; Zhou, Baojing; Yu, Jiangsheng; Zhang, Zhuohan; Ellingson, Randy J.; Zhou, Jie; Yan, Yanfa; Tang, Weihua

doi:10.1016/j.nanoen.2018.07.027

Cited by 62 publications

(47 citation statements)

References 43 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The slope for the PTAA:NPB-based devices (0.11 KBT/q) was smaller than that obtained for the reference devices (0.17 KBT/q). The smaller slope illustrates the fact that doping NPB effectively suppresses trap-assisted charge recombination, which is also in agreement with the conclusion above that NPB doping results in a reduced recombination loss and increased charge lifetimes, thereby contributing to improved device efficiency [66,67].…”

Section: Mott-schottky (M-s) Analysis Via Capacitance-voltage Measuresupporting

confidence: 89%

π-Conjugated small molecules enable efficient perovskite growth and charge-extraction for high-performance photovoltaic devices

Liu

Yang

et al. 2020

Journal of Power Sources

View full text Add to dashboard Cite

A π-conjugated small molecule ,N'-bis(naphthalen-1-yl)-N,N'+-bis(phenyl)benzidine (NPB) is introduced into a poly (bis(4-phenyl)(2,4,6-trimethylphenyl)amine) (PTAA) hole transport layer in inverted perovskite solar cells (PSCs). The NPB doping induces better perovskite crystal growth owing to a strong π-π interaction with PTAA and cation-π interactions with CH3NH3 + (MA +). In addition, NPB doping not only improves the wettability of PTAA and regulates the perovskite crystallization to achieve a larger grain size, but also moves the valence band energy of the hole transport layer closer to the perovskite layer. Consequently, the fabricated PSCs delivered a power conversion efficiency (PCE) of 20.15%, with a short-circuit current density (JSC) of 22.60 mA/cm 2 and open-circuit voltage (VOC) of 1.14 V. This outcome 2 indicates that PTAA:NPB composite materials present great potential for fabricating high-performance PSCs.

show abstract

Section: Mott-schottky (M-s) Analysis Via Capacitance-voltage Measuresupporting

confidence: 89%

π-Conjugated small molecules enable efficient perovskite growth and charge-extraction for high-performance photovoltaic devices

Liu

Yang

et al. 2020

Journal of Power Sources

View full text Add to dashboard Cite

show abstract

“…[ 7 ] Despite the sky‐rocketing progress in efficiency, the moisture and thermal instability of 3D PSCs hinder the future commercialization. [ 8–10 ] To improve stability, quasi 2D (Q‐2D) Ruddlesden–Popper (RP) perovskites have been adopted owing to their better moisture stability, stemming from hydrophobic bulky organic cations which resist moisture invasion into the perovskite lattice. [ 11,12 ] Typically, such Q‐2D RP perovskites are expressed as (R‐NH 3 ) 2 A n −1 M n X 3 n +1 ( n = 1, 2, 3, 4…), where R‐NH 3 is primary aromatic or aliphatic alkylammonium spacer cation (e.g., phenethylammonium (PEA + ), butylammonium (BA + )), A is an interstitial cation (e.g., Cs + , methylammonium (MA + ), formamidinium (FA + )), M is a divalent metal cation (e.g., Pb 2+ , Sn 2+ ), X is a halide anion (e.g., I − , Br − , Cl − ), and n is the layer number of inorganic [MX 6 ] 4− octahedral slabs between two R‐NH 3 spacers.…”

Section: Introductionmentioning

confidence: 99%

Spacer Cation Tuning Enables Vertically Oriented and Graded Quasi‐2D Perovskites for Efficient Solar Cells

Wang

Wei

Liu

et al. 2020

Adv Funct Materials

Self Cite

103

135

View full text Add to dashboard Cite

Halide substitution in phenethylammonium spacer cations (X‐PEA+, X = F, Cl, Br) is a facile strategy to improve the performance of PEA based perovskite solar cells (PSCs). However, the power conversion efficiency (PCE) of X‐PEA based quasi‐2D (Q‐2D) PSCs is still unsatisfactory and the underlying mechanisms are in debate. Here, the in‐depth study on the impact of halide substitution on the crystal orientation and multi‐phase distribution in PEA based perovskite films are reported. The halide substitution eliminates n = 1 2D perovskite and thus leads to the perpendicular crystal orientation. Furthermore, nucleation competition exists between small‐n and large‐n phases in PEA and X‐PEA based perovskites. This gives rise to the orderly distribution of different n‐phases in the PEA and F‐PEA based films, and random distribution in Cl‐PEA and Br‐PEA based films. As a result, (F‐PEA)2MA3Pb4I12 (MA = CH3NH3+, n = 4) based PSCs achieve a PCE of 18.10%, significantly higher than those of PEA (12.23%), Cl‐PEA (7.93%) and Br‐PEA (6.08%) based PSCs. Moreover, the F‐PEA based devices exhibit remarkably improved stability compared to their 3D counterparts.

show abstract

“…CZ-TA possesses 1,3,6,8-substituted p -dimethoxytriphenylamine units, while HL-2 is 2,7-substituted with o , p -dimethoxyphenyl-extended diphenylamine units. Very recently, a significantly enhanced photovoltaic performance of 19.85% and device stability have been realized by adding 10 wt% of the sister molecule methylthio-substituted CZ-STA to CZ-TA as a blend HTL 127. A simple dimethoxydiphenylamine substituted N -ethylhexyl carbazole HTM EH44 was recently reported to achieve 18.5% PCE with 1000 hour operational stability due to HTM oxidation by AgTFSI 128.…”

Section: Introductionmentioning

confidence: 99%

Efficiencyvs.stability: dopant-free hole transporting materials towards stabilized perovskite solar cells

2019

View full text Add to dashboard Cite

show abstract

Binary hole transport materials blending to linearly tune HOMO level for high efficiency and stable perovskite solar cells

Cited by 62 publications

References 43 publications

π-Conjugated small molecules enable efficient perovskite growth and charge-extraction for high-performance photovoltaic devices

π-Conjugated small molecules enable efficient perovskite growth and charge-extraction for high-performance photovoltaic devices

Spacer Cation Tuning Enables Vertically Oriented and Graded Quasi‐2D Perovskites for Efficient Solar Cells

Efficiencyvs.stability: dopant-free hole transporting materials towards stabilized perovskite solar cells

Contact Info

Product

Resources

About