High‐Performance Multilayer Encapsulation for Perovskite Photovoltaics

Wong‐Stringer, Michael; Game, Onkar; Smith, Joel A.; Routledge, Thomas J.; Alqurashy, Bakhet A.; Freestone, Benjamin G.; Parnell, Andrew J.; Vaenas, Naoum; Kumar, Vikas; Alawad, Majed O.; Iraqi, Ahmed; Rodenburg, Cornelia; Lidzey, David G.

doi:10.1002/aenm.201801234

Cited by 81 publications

(69 citation statements)

References 55 publications

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“…Despite the impressive high efficiency, the stability of PSCs lags far behind the requirement for future commercialization. [16][17][18][19][20] However, there is still great challenge to obtain long-term stability and further investigation is urgent. [3,9,10] Efforts have been carried out to improve the stability of PSCs such as solvent engineering, [11][12][13] interface engineering, [14,15] composition engineering, and encapsulation.…”

Section: Introductionmentioning

confidence: 99%

Efficient Passivation with Lead Pyridine‐2‐Carboxylic for High‐Performance and Stable Perovskite Solar Cells

Wan

et al. 2019

Advanced Energy Materials

168

127

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Stability has become the main obstacle for the commercialization of perovskite solar cells (PSCs) despite the impressive power conversion efficiency (PCE). Poor crystallization and ion migration of perovskite are the major origins of its degradation under working condition. Here, high‐performance PSCs incorporated with pyridine‐2‐carboxylic lead salt (PbPyA2) are fabricated. The pyridine and carboxyl groups on PbPyA2 can not only control crystallization but also passivate grain boundaries (GBs), which result in the high‐quality perovskite film with larger grains and fewer defects. In addition, the strong interaction among the hydrophobic PbPyA2 molecules and perovskite GBs acts as barriers to ion migration and component volatilization when exposed to external stresses. Consequently, superior optoelectronic perovskite films with improved thermal and moisture stability are obtained. The resulting device shows a champion efficiency of 19.96% with negligible hysteresis. Furthermore, thermal (90 °C) and moisture (RH 40–60%) stability are improved threefold, maintaining 80% of initial efficiency after aging for 480 h. More importantly, the doped device exhibits extraordinary improvement of operational stability and remains 93% of initial efficiency under maximum power point (MPP) tracking for 540 h.

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Section: Introductionmentioning

confidence: 99%

Efficient Passivation with Lead Pyridine‐2‐Carboxylic for High‐Performance and Stable Perovskite Solar Cells

Wan

et al. 2019

Advanced Energy Materials

168

127

View full text Add to dashboard Cite

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“…Continued progress in stability remains a topic of importance along the path to industrial application [3][4][5] . Encapsulating PSCs to protect against oxygen and moisture is a straightforward method to stabilize these devices [6][7][8] ; however, some important sources of instability are not overcome using extrinsic stabilization approaches such as encapsulation 9 .…”

mentioning

confidence: 99%

Regulating strain in perovskite thin films through charge-transport layers

et al. 2020

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Thermally-induced tensile strain that remains in perovskite films following annealing results in increased ion migration and is a known factor in the instability of these materials. Previously-reported strain regulation methods for perovskite solar cells (PSCs) have utilized substrates with high thermal expansion coefficients that limits the processing temperature of perovskites and compromises power conversion efficiency. Here we compensate residual tensile strain by introducing an external compressive strain from the hole-transport layer. By using a hole-transport layer with high thermal expansion coefficient, we compensate the tensile strain in PSCs by elevating the processing temperature of hole-transport layer. We find that compressive strain increases the activation energy for ion migration, improving the stability of perovskite films. We achieve an efficiency of 16.4% for compressively-strained PSCs; and these retain 96% of their initial efficiencies after heating at 85°C for 1000 hoursthe most stable wide-bandgap perovskites (above 1.75 eV) reported so far.

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“…[19][20][21][22] For example, it has been shown that ultra-thin layers of poly(triarylamine) (PTAA) or poly(4butylphenyldiphenylamine) (poly-TPD) can be used as HTMs to achieve remarkable V OC and fill factor (FF). [22][23][24][25] Here however, our architecture requires that the charge-transport layers are easily evaporable.…”

Section: Papermentioning

confidence: 99%