Energetics and Energy Loss in 2D Ruddlesden–Popper Perovskite Solar Cells

Yang, Jianming; Xiong, Shaobing; Song, Jingnan; Wu, Hongbo; Zeng, Yihan; Lu, Linyang; Shen, Kongchao; Hao, Tianyu; Ma, Zaifei; Liu, Feng; Duan, Chun‐Gang; Fahlman, Mats; Bao, Qinye

doi:10.1002/aenm.202000687

Cited by 85 publications

(81 citation statements)

References 46 publications

(62 reference statements)

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“…Humidity stability of pero‐SCs is always a bottleneck, which hinders their practical application due to the fact that water, as a catalyst, accelerates the decomposition of perovskite. [ 10,62–65 ] Therefore, we determined the ambient stabilities of the unencapsulated pero‐SCs based on Pero‐pristine, Pero‐Th‐0.05, and Pero‐I‐0.1 under a high RH of 70–80%. As shown in Figure 6d, after 864 h, the PCE of pero‐SC with Pero‐pristine decreased significantly to 66% of its initial efficiency.…”

Section: Resultsmentioning

confidence: 99%

Organic N‐Type Molecule: Managing the Electronic States of Bulk Perovskite for High‐Performance Photovoltaics

Chen

Zhan

et al. 2020

Adv Funct Materials

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The power conversion efficiency (PCE) of planar p–i–n perovskite solar cells (pero‐SCs) is commonly lower than that of the n–i–p pero‐SCs, due to the severe nonradiative recombination stemming from the more p‐type perovskite with prevailing electron traps. Here, two n‐type organic molecules, DMBI‐2‐Th and DMBI‐2‐Th‐I, with hydrogen‐transfer properties for the doping of bulk perovskite aimed at regulating its electronic states are synthesized. The generated radicals in these n‐type dopants with high‐lying singly occupied molecular orbitals enable easy transfer of the thermally activated electrons to the MAPbI3 perovskite for the realization of n‐doped perovskites. The n‐doping degree could be further enhanced by using the iodine ionized dopant DMBI‐2‐Th‐I. The doping effect could reduce the electron trap density, increase the electron concentration of the bulk perovskite, and simultaneously improve the surface electronic contact. When the DMBI‐2‐Th‐I‐doped perovskite is used in planar p–i–n pero‐SCs, the nonradiative recombination is significantly suppressed. As a result, the photovoltaic performance improved significantly, as evidenced by an excellent PCE of 20.90% and a robust ambient stability even under high relative humidity. To the best of the knowledge, this work represents the first example where organic n‐type dopants are used to tune the electronic states of a bulk perovskite film for efficient planar p–i–n pero‐SCs.

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Section: Resultsmentioning

confidence: 99%

Organic N‐Type Molecule: Managing the Electronic States of Bulk Perovskite for High‐Performance Photovoltaics

Chen

Zhan

et al. 2020

Adv Funct Materials

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“…Therefore, the transfer of electrons from the perovskite layer to the anode is greatly increased. Yang et al discovered that unlike a traditional p/n-type heterojunction formed through pure 2D/3D perovskites (n = 1, ∞), the C 61 -butyric acid methyl ester (PCBM) interface, and quasi-2D perovskites (n = 3, 5, 40), a junction was formed when the PCBM interface was involved, thereby reducing the hole concentration at the interface and inhibiting an interface recombination [ 96 ]. Yoo, Jason J et.al displayed a (linear alkyl ammonium bromide/chloroform) post-processing strategy that can effectively passivate the interface and grain boundary defects and increase the moisture resistance to generate layered perovskite in situ on a 3D perov-skite film.…”

Section: Interface Modificationmentioning

confidence: 99%

Review of Interface Passivation of Perovskite Layer

Wang

Liu

et al. 2021

Nanomaterials

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Perovskite solar cells (PSCs) are the most promising substitute for silicon-based solar cells. However, their power conversion efficiency and stability must be improved. The recombination probability of the photogenerated carriers at each interface in a PSC is much greater than that of the bulk phase. The interface of a perovskite polycrystalline film is considered to be a defect-rich area, which is the main factor limiting the efficiency of a PSC. This review introduces and summarizes practical interface engineering techniques for improving the efficiency and stability of organic–inorganic lead halide PSCs. First, the effect of defects at the interface of the PSCs, the energy level alignment, and the chemical reactions on the efficiency of a PSC are summarized. Subsequently, the latest developments pertaining to a modification of the perovskite layers with different materials are discussed. Finally, the prospect of achieving an efficient PSC with long-term stability through the use of interface engineering is presented.

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“…Work function is the minimum energy required when an electron is transported from the Fermi level of a solid material to infinite distance. [ 26 ] It can be calculated based on the Fermi edge, secondary‐band edge, and hv of a He I source (see the Experimental Section in the Supporting Information). The work function of NiTe 2 (5.69 eV) was calculated to be higher than that of ZnTe (4.61 eV).…”

Section: Resultsmentioning

confidence: 99%

Antiblocking Heterostructure to Accelerate Kinetic Process for Na‐Ion Storage

Sun

Liu

et al. 2020

Small

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Heterostructures are attracting increasing attention in the field of sodium‐ion batteries. However, it is still unclear whether any two monophase components can be used to construct a high‐performance heterostructure for sodium‐ion batteries, as well as the kind of heterostructures that can boost electrochemical performances. In this study, based on classical semiconductor theories on antiblocking and blocking interfaces, attempts are made to answer the abovementioned queries. For this purpose, NiTe2–ZnTe antiblocking and CoTe2–ZnTe blocking heterostructures are synthesized through a bimetal‐hexamine framework‐derived strategy. The NiTe2–ZnTe antiblocking heterostructure exhibits excellent high‐rate and cycling performances, while the CoTe2–ZnTe blocking heterostructure performs poorly, even compared to their monophase components. Further, kinetic measurements and theoretical calculation confirm that antiblocking heterointerfaces can boost Na‐ion diffusion efficiency and decrease the diffusion barrier, which can be attributed to the highly conductive antiblocking heterointerfaces generated due to electron transfer from NiTe2 to ZnTe. Therefore, this study provides a new perspective to design heterostructures more efficiently, with significantly better Na‐ion storage performance.

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Energetics and Energy Loss in 2D Ruddlesden–Popper Perovskite Solar Cells

Cited by 85 publications

References 46 publications

Organic N‐Type Molecule: Managing the Electronic States of Bulk Perovskite for High‐Performance Photovoltaics

Organic N‐Type Molecule: Managing the Electronic States of Bulk Perovskite for High‐Performance Photovoltaics

Review of Interface Passivation of Perovskite Layer

Antiblocking Heterostructure to Accelerate Kinetic Process for Na‐Ion Storage

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