Defect Management and Ion Infiltration Barrier Enable High-Performance Perovskite Solar Cells

Liu, Heng; Wang, Jiantao; Qu, Yating; Zhou, Hongkang; Xia, Yu; Shi, Yueqing; Chen, Rui; Shi, Tingting; De Wolf, Stefaan; Zhang, Weihai; Wang, Hsing-Lin

doi:10.1021/acsenergylett.4c00059

Cited by 10 publications

(1 citation statement)

References 54 publications

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“…Perovskite solar cells (PSCs) have emerged as a leading direction in future clean energy production due to their excellent photovoltaic performance, low-temperature and environmentally friendly preparation methods, and cost-effective raw materials. , After years of extensive research and development, the photoelectric performance of PSCs has made significant strides, achieving an impressive conversion efficiency of 26.14%. , Enhancement of stability is an indispensable aspect for the commercialization of perovskite solar cells. , Factors such as oxygen, moisture, and heat lead to the degradation of perovskite and have been the focal points of research in recent years. − Additionally, there is growing attention toward the mechanism of decreased stability in the perovskite solar cells due to ion migration between the electrode and the perovskite. , …”

Section: Introductionmentioning

confidence: 99%

Enhancing Performance and Stability of p-i-n Perovskite Solar Cells with Ag–Cu Codeposited Alloy Electrodes

Li,

Peng,

Zhou

et al. 2024

ACS Appl. Mater. Interfaces

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In the development of back electrodes for perovskite solar cells (PSCs), the major challenges are stability and cost. To address this, we present an innovative approach: Simultaneous evaporation of two independently controlled sources of metal materials was performed to achieve a uniform distribution of the alloy electrodes. In this study, Ag−Cu alloys (the molar ratio of Ag/Cu is 7/3) with a highindex crystal face (111) and a work function matching perovskite were prepared using a codeposition technique. These properties mitigate nonradiative carrier recombination at the interface and reduce the energy barrier for carrier migration. Consequently, compared to Ag based PSCs (22.77%), the implementation of Ag−Cu alloy (Ag/Cu is 7/3)-based PSCs resulted in a power conversion efficiency of 23.72%. In a 1500 h tracking test in ambient air, the Ag−Cu alloy (Ag/Cu is 7/3)-based PSCs maintained their initial efficiency of 86%. This can be attributed to almost no migration of elements from the Ag−Cu alloy electrode to the perovskite layer. Our work presents a vital strategy for improving the stability of PSCs and reducing the costs associated with the back electrode in PSCs.

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Section: Introductionmentioning

confidence: 99%

Enhancing Performance and Stability of p-i-n Perovskite Solar Cells with Ag–Cu Codeposited Alloy Electrodes

Li,

Peng,

Zhou

et al. 2024

ACS Appl. Mater. Interfaces

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Energy Level Alignment Regulation and Carrier Management in Perovskite Solar Cells with Various Bandgaps Using Tailored Metal‐Organic Frameworks

Xiao,

Zhang,

Xiong

et al. 2024

Adv Funct Materials

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The interface energy level alignment modulation and charge carrier transportation play an important role in the device performance of perovskite solar cells (PSCs). Herein, tailored hydrophobic metal‐organic frameworks (MOFs) are employed as interfacial layers between perovskite absorbers and hole transport layers (HTLs). The tailored MOFs feature abundant carboxylic acid groups capable of bonding with Pb2+ and organic cations, which can effectively passivate interface defects and suppress non‐radiative recombination. Meanwhile, the MOF interfacial layers optimized the energy level alignment between the perovskite and the HTL, further facilitating carrier transportation. Specifically, the CsFAMA‐based PSCs with a bandgap of 1.63 eV attained power conversion efficiency (PCE) of 23.06% upon modification with MOFs. Additionally, the MOFs‐treated FA‐based PSCs with a bandgap of 1.55 eV achieved a remarkable PCE of 24.81%, accompanied by an outstanding fill factor of 84.3% and a minimal open‐circuit voltage loss of merely 0.386 V. Furthermore, the integration of the MOF interfacial layer substantially improved the moisture stability of the PSCs. The unencapsulated CsFAMA PSCs modified with MOFs retained 91.2% of their initial efficiency after 2500 h of aging under ambient conditions with 40% relative humidity (RH). This work underpins the commercialization of PSCs with diverse bandgaps.

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Cross‐Linkable Fullerene Electron Transport Layer with Internal Encapsulation Capability for Efficient and Stable Inverted Perovskite Solar Cells

Hou,

Cheng,

Qiu

et al. 2024

Angewandte Chemie

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A stable and compact fullerene electron transport layer (ETL) is crucial for high‐performance inverted perovskite solar cells (PSCs). However, traditional fullerene‐based ETLs like C60 and PCBM are prone to aggregate under operational conditions, a challenge recently recognized by academic and industrial researchers. Here, we designed and synthesized a novel cross‐linkable fullerene molecule, bis((3‐methyloxetan‐3‐yl)methyl) malonate‐C60 monoadduct (BCM), for use as an ETL in PSCs. Upon a low‐temperature annealing at 100 °C, BCM undergoes in‐situ cross‐linking to form a robust cross‐linked BCM (CBCM) film, which demonstrates excellent electron mobility and a suitable band structure for efficient PSCs. Our results show that PSCs incorporating CBCM‐based ETL achieve an impressive efficiency of 25.89% (certified: 25.36%), significantly surpassing the 23.25% efficiency of PCBM‐based devices. The intramolecular covalent interactions within CBCM films effectively prevent aggregation and enhance film compactness, creating an internal encapsulation layer that mitigates the decomposition and ion migration of perovskite components. Consequently, CBCM‐based PSCs show exceptional stability, maintaining 97.8% of their initial efficiency after 1000 hours of maximum power point tracking, compared to only 78.6% retention in PCBM‐based devices after less than 820 hours.

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Defect Management and Ion Infiltration Barrier Enable High-Performance Perovskite Solar Cells

Cited by 10 publications

References 54 publications

Enhancing Performance and Stability of p-i-n Perovskite Solar Cells with Ag–Cu Codeposited Alloy Electrodes

Enhancing Performance and Stability of p-i-n Perovskite Solar Cells with Ag–Cu Codeposited Alloy Electrodes

Energy Level Alignment Regulation and Carrier Management in Perovskite Solar Cells with Various Bandgaps Using Tailored Metal‐Organic Frameworks

Cross‐Linkable Fullerene Electron Transport Layer with Internal Encapsulation Capability for Efficient and Stable Inverted Perovskite Solar Cells

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