Highly Thermostable and Efficient Formamidinium‐Based Low‐Dimensional Perovskite Solar Cells

Cheng, Lei; Liu, Zhou; Li, Shunde; Zhai, Yufeng; Wang, Xiao; Qiao, Zhiqiang; Xu, Qiaofei; Meng, Ke; Zhu, Zhiyuan; Chen, Gang

doi:10.1002/anie.202006970

Cited by 86 publications

(103 citation statements)

References 62 publications

(28 reference statements)

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“…[25] Here, devices retain 95% of the initial PCE after continuous aging for 168 h under 85 °C and RH 85% conditions; devices under standard light soaking conditions, retain 95% of the initial PCE for 3000 h. Furthermore, partial or full substitution of the MA-cation with the more thermally stable FA can lead to stability improvements. [143,144] For instance, a 2.5 times higher decomposition activation energy (E a = 184.7 kJ mol −1 ) was reported for (PDA)(FA) 3 Pb 4 I 13 resulting in 86 % PCE retained for 1000 h at 85 °C, whilst the (PDA)(MA) 3 Pb 4 I 13 analogue with E a = 74.3 kJ mol −1 degrades to 50% of the original PCE in only 100 h. [145] Finally, DJ-spacers can be used to Figure 6. Schematic representation of processes related to the stability of LPKs.…”

Section: Phase Stability Of Dion-jacobson Perovskitesmentioning

confidence: 91%

Layered Perovskites in Solar Cells: Structure, Optoelectronic Properties, and Device Design

Sirbu

Balogun

Milot

et al. 2021

Advanced Energy Materials

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optoelectronic properties akin to industrial juggernauts gallium arsenide and silicon. [1,2] Yet, the materials are compatible with solution-processing techniques such as inkjet printing and spray coating. [3] This unprecedented combination has led to the development of solar cells which already show power conversion efficiencies of over 25%, similar to state-of-the-art poly-Si and other thin-film technologies, in just over 10 years of development. [4] Hybrid perovskites are particularly interesting for indoor applications, with impressive efficiencies of over 35% demonstrated under indoor illumination which may prove a viable option to power the ever expanding Internet of Things. [5] Rather than competing with the current technology giants, perovskites can work together with other solar cell technologies in a tandem configuration. Record efficiencies of over 29% for silicon-perovskite tandem solar cells have already been reported and further progress is expected in the near future. [6] Although perovskite solar cells (PSCs) are on the verge of mass production, two main challenges remain: stability [7] and toxicity. [8] Multiple reviews already address the toxicity concern, and it will not be discussed here. [9][10][11] Layered hybrid perovskites (LPKs) have emerged as an answer to battle stability concerns. Although known for decades, LPKs have only recently been incorporated in photovoltaic (PV) applications, resulting in modest device power conversion efficiencies due to poorer optoelectronic properties. [12][13][14] However, their key advantage is the stabilizing effects of the organic interlayers, which prevents perovskite degradation. [15,16] The organic spacer inhibits ion migration which prevents the formation of irreversible degradation products. [17] Alternatively, LPKs can be deposited over the state-of-the-art perovskite materials to combine the high performance of 3D perovskites with the stabilizing properties of LPKs. [15] Here, the limiting factor is inefficient charge transport across the organic interlayer, currently preventing the full exploitation of the layered structure in PSCs.This can be approached in two ways, either by keeping the LPK layer very thin, currently the most popular approach, or by increasing the electrical conductivity of the material. [18,19] The conductivity can be enhanced through increasing the number of inorganic layers n, but this comes at the price of reduced stability. [20][21][22] The better approach is to enhance the charge transport in LPKs through the molecular engineering of the organic Layered hybrid perovskites (LPKs) have emerged as a viable solution to address perovskite stability concerns and enable their implementation in wide-scale energy harvesting. Yet, although more stable, the performance of devices incorporating LPKs still lags behind that of state-of-the-art, multication perovskite materials. This is typically assigned to their poor charge transport, currently caused by the choice of cations used within the organic layer. On balance, a compromise bet...

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Section: Phase Stability Of Dion-jacobson Perovskitesmentioning

confidence: 91%

Layered Perovskites in Solar Cells: Structure, Optoelectronic Properties, and Device Design

Sirbu

Balogun

Milot

et al. 2021

Advanced Energy Materials

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“…For the highly efficient PSCs, the hole transporting materials (HTMs) are critical in promoting the charge extraction and transport as well as inhibiting the photo‐induced carrier recombination [7–9] . It mainly involves the triarylamine derivatives, such as poly(triarylamine) (PTAA) [10, 11] or 2,2′,7,7′‐tetrakis‐( N , N ‐di‐ p ‐methoxyphenylamine)‐9,9′‐spiro‐bifluorene (Spiro‐OMeTAD) [12–15] . These organic HTMs are typically expensive and reveal the low hole mobility and conductivity [16, 17] .…”

Section: Figurementioning

confidence: 99%

Intramolecular Electric Field Construction in Metal Phthalocyanine as Dopant‐Free Hole Transporting Material for Stable Perovskite Solar Cells with >21 % Efficiency

Wang

et al. 2021

Angew Chem Int Ed

114

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Low conductivity and hole mobility in the pristine metal phthalocyanines greatly limit their application in perovskite solar cells (PSCs) as the hole‐transporting materials (HTMs). Here, we prepare a Ni phthalocyanine (NiPc) decorated by four methoxyethoxy units as HTMs. In NiPc, the two oxygen atoms in peripheral substituent have a modified effect on the dipole direction, while the central Ni atom contributes more electron to phthalocyanine ring, thus efficiently increasing the intramolecular dipole. Calculation analyses reveal the extracted holes within NiPc are mainly concentrated on the phthalocyanine core induced by the intramolecular electric field, and further to be transferred by π‐π stacking space channel between NiPc molecules. Finally, the best efficiency of PSCs with NiPc as dopant‐free HTMs realizes a record value of 21.23 % (certified 21.03 %). The PSCs also exhibit the good moisture, heating and light stabilities. This work provides a novel way to improve the performance of PSCs with free‐doped metal phthalocyanines as HTMs.

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“…(PDA)(MA)3Pb4I13 films turned to brown within 1 hour and gradually changed to non-perovskite (yellow) phase after 3 hours while the FA counterpart showed exceptional stability until 12 hours of continuous thermal stress. Further, the corresponding PSCs were tested for thermal stability at 85 o C under N2 atmosphere in dark (Figure 4d) [53] . The knowledge capitalized from MA system, it is vital to focus on the rational selection of organic spacer and crystallization routes to optimize the FA systems.…”

Section: Compositional and Dimensional Engineeringmentioning

confidence: 99%

Substance and shadow of formamidinium lead triiodide based solar cells

Kazim

Pegu

et al. 2021

Phys. Chem. Chem. Phys.

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Highly Thermostable and Efficient Formamidinium‐Based Low‐Dimensional Perovskite Solar Cells

Cited by 86 publications

References 62 publications

Layered Perovskites in Solar Cells: Structure, Optoelectronic Properties, and Device Design

Layered Perovskites in Solar Cells: Structure, Optoelectronic Properties, and Device Design

Intramolecular Electric Field Construction in Metal Phthalocyanine as Dopant‐Free Hole Transporting Material for Stable Perovskite Solar Cells with >21 % Efficiency

Substance and shadow of formamidinium lead triiodide based solar cells

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