Zijian Peng

Friedrich-Alexander-Universität Erlangen-Nürnberg

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Christoph J. Brabec

Friedrich-Alexander-Universität Erlangen-Nürnberg

Kaicheng Zhang

Friedrich-Alexander-Universität Erlangen-Nürnberg

Larry Lüer

Friedrich-Alexander-Universität Erlangen-Nürnberg

Ning Li

Henan University

Andres Osvet

Friedrich-Alexander-Universität Erlangen-Nürnberg

Jiyun Zhang

Helmholtz Institute Erlangen-Nürnberg

Thomas Heumueller

Friedrich-Alexander-Universität Erlangen-Nürnberg

Jingjing Tian

East China University of Science and Technology

Vincent M. Le Corre

Friedrich-Alexander-Universität Erlangen-Nürnberg

Shudi Qiu

Friedrich-Alexander-Universität Erlangen-Nürnberg

Cooperative Institutions

Friedrich-Alexander-Universität Erlangen-Nürnberg

Helmholtz Institute Erlangen-Nürnberg

Forschungszentrum Jülich

South China University of Technology

University of Electronic Science and Technology of China

State Key Laboratory of Electronic Thin Films and Integrated Devices

Chinese Academy of Sciences

Bavarian Center for Applied Energy Research

State Key Laboratory of Luminescent Materials and Devices

Peking University

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Controlling Intermediate Phase Formation to Enhance Photovoltaic Performance of Inverted FA-Based Perovskite Solar Cells

ACS Energy Letters (2024)

Chaohui Li Hyoungwon Park Shudi Qiu Fabian Streller Kaicheng Zhang

Formamidinium (FA)-based perovskites exhibit significant potential for highly efficient photovoltaics due to their promising optoelectronic properties and optimal bandgap. However, the undesired inactive phase arises from multiple crystal nucleation pathways formed by various intermediate phases during the film formation process, persistently accompanying it. FA-based perovskites frequently struggle to form uniform, highly crystalline films. This challenge complicates the development of reliable and highly reproducible crystallization processes for perovskites and the establishment of guidelines for controlling the α-phase formation. In this work, we investigate the role of poly(acrylonitril-co-methyl acrylate) (PAM) to simultaneously control nucleation and subsequent α-phase crystallization. This successfully demonstrates the regulation of oriented crystal growth through the creation of a PAM-PbI2 intermediate. Ultimately, PAM-modified p–i–n architecture devices obtain a promising power conversion efficiency (PCE) of 25.30%, with VOC (1.211 V), achieving 95% of the detailed balance limit. Additionally, PAM-modified devices maintain ≥90% of the initial efficiency for 1000 h under 1 sun and 65 °C operation.

10.1021/acsenergylett.4c02580

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Durable all inorganic perovskite tandem photovoltaics

Nature (2024)

Chenghao Duan Kaicheng Zhang Zijian Peng Shiang Li Feilin Zou

Tandem

Formamidinium

10.1038/s41586-024-08432-7

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Citations (4)

Revealing Degradation Mechanisms in 3D/2D Perovskite Solar Cells under Photothermal Accelerated Ageing

Energy & Environmental Science (2024)

Zijian Peng Á. Vincze Fabian Streller Vincent M. Le Corre Kaicheng Zhang

Three-dimensional/two-dimensional (3D/2D) heterojunctions in perovskite solar cells exhibit excellent optoelectronic properties and enhanced stability under mild ageing conditions. However, their performance degrades drastically under harsh ageing conditions. This study reveals...

Degradation

Accelerated aging

10.1039/d4ee03869j

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Precise control of process parameters for >23% efficiency perovskite solar cells in ambient air using an automated device acceleration platform

Energy & Environmental Science (2024)

Jiyun Zhang Jianchang Wu Anastasia Barabash Tian Du Shudi Qiu

Using a fully automated device acceleration platform (DAP) to systematically optimize air-processed parameters and establish a standard operation procedure (SOP) for preparing high-performance perovskite solar cells under ambient air.

10.1039/d4ee01432d

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Quantifying the Energy Losses in CsPbI₂Br Perovskite Solar Cells with an Open-Circuit Voltage of up to 1.45 V

ACS Energy Letters (2022)

Jingjing Tian Kaicheng Zhang Zhiqiang Xie Zijian Peng Jiyun Zhang

CsPbI2Br perovskite solar cells (PSCs) have attracted much interest because of their thermodynamic stability, relatively stable cubic perovskite phase, and their potential as a top cell for tandem applications. However, the open-circuit voltage (VOC) reported to date is in most cases well below the detailed balance (DB) limit for single-junction PSCs. Here, we demonstrate that adding lead acetate to the CsPbI2Br precursor allows us to substantially reduce losses due to nonradiative recombination. Corresponding champion devices reach a power conversion efficiency (η) of 16.7% and a highest VOC value of 1.45 V, which represents 90% of the DB limit for single-junction PSCs at a bandgap of 1.89 eV. In order to disentangle the nonradiative recombination loss mechanisms, we quantify the origin of energy losses by calculating the radiative limit of the open-circuit voltage (VOCrad) and the quasi-Fermi level splitting (QFLS) of perovskite films with and without other functional layers. We further analyze the strategies to reduce the residual losses in order to push the efficiency beyond the 90% theoretical limit.

Open-circuit voltage

Perovskite solar cell

10.1021/acsenergylett.2c01883

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Citations (52)

A High Throughput Platform to Minimize Voltage and Fill Factor Losses

Advanced Energy Materials (2025)

Julian Matthias Haffner‐Schirmer Vincent M. Le Corre Karen Forberich Hans‐Joachim Egelhaaf Tobias Osterrieder

Abstract Organic photovoltaics (OPV) now can exceed 20% power conversion efficiency in single junction solar cells. To close the remaining gap to competing technologies, both fill factor and open‐circuit voltage must be optimized. The Langevin reduction factor is a well‐known concept that measures the degree to which charge extraction is favored over charge recombination. It is therefore ideally suited as an optimization target in high‐throughput workflows; however, its evaluation so far requires expert interaction. Here, an integrated high‐throughput workflow is presented, able to obtain the Langevin reduction factor within a few seconds with high accuracy without human intervention and thus suited for autonomous experiments. This is achieved by combining evidence from UV–vis spectra, current–voltage curves, and a novel implementation of microsecond transient absorption kinetics allowing, for the first time, the intrinsic determination of charge absorption cross‐sections, which is crucial to reporting stationary charge densities. The method is demonstrated by varying the donor:acceptor ratio of the high performance OPV blend PM6:Y12. The high reproducibility of the method allows to find a strictly exponential relationship between the PM6 exciton energy and the Langevin reduction factor.

10.1002/aenm.202403479

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Accelerating Photostability Evaluation of Perovskite Films through Intelligent Spectral Learning-Based Early Diagnosis

ACS Energy Letters (2024)

Ziyi Liu Jiyun Zhang Gaofeng Rao Zijian Peng Yixing Huang

Obtaining highly stable metal-halide perovskites is crucial for the commercialization of perovskite solar cells. However, current methods for evaluating perovskite stability mainly rely on a time-consuming and resource-intensive aging process. Here, we demonstrate a spectral learning-based methodology that enables the prediction of perovskite stability by leveraging the features in photoluminescence and absorption spectra of fresh perovskite films. This methodology circumvents the long-term aging process by combining a custom-developed spectral feature extraction algorithm and an integrated voting machine learning model. By integration of the early diagnosis program with high-throughput experiments, the prediction accuracy for stable perovskites exceeds 86% in 160 fresh samples. The universality is further examined by another batch of 224 fresh samples fabricated through different processing conditions. Finally, the early diagnosis of perovskite films is successfully translated to enhanced stability in perovskite solar cells. Our work provides a new pathway to accelerate the discovery and development of stable perovskite films.

10.1021/acsenergylett.3c02666

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Overcoming optical losses in thin metal-based recombination layers for efficient n-i-p perovskite-organic tandem solar cells

Nature Communications (2025)

Jingjing Tian Chao Liu Karen Forberich Anastasia Barabash Zhiqiang Xie

Abstract Perovskite-organic tandem solar cells (P-O-TSCs) hold substantial potential to surpass the theoretical efficiency limits of single-junction solar cells. However, their performance is hampered by non-ideal interconnection layers (ICLs). Especially in n-i-p configurations, the incorporation of metal nanoparticles negatively introduces serious parasitic absorption, which alleviates photon utilization in organic rear cell and decisively constrains the maximum photocurrent matching with front cell. Here, we demonstrate an efficient strategy to mitigate optical losses in Au-embedded ICLs by tailoring the shape and size distribution of Au nanoparticles via manipulating the underlying surface property. Achieving fewer, smaller, and more uniformly spherical Au nanoparticles significantly minimizes localized surface plasmon resonance absorption, while maintaining efficient electron-hole recombination within ICLs. Consequently, optimized P-O-TSCs combining CsPbI 2 Br with various organic cells benefit from a substantial current gain of >1.5 mA/cm 2 in organic rear cells, achieving a champion efficiency of 25.34%. Meanwhile, optimized ICLs contribute to improved long-term device stability.

Tandem

Photocurrent

10.1038/s41467-024-55376-7

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Reducing Open-Circuit Voltage Losses in All-Inorganic Perovskite Cells by Dedoping

ACS Energy Letters (2023)

Zijian Peng Jingjing Tian Kaicheng Zhang Albert These Zhiqiang Xie

CsPbI2Br is an attractive photovoltaic material due to its promising optoelectronic properties. However, the corresponding perovskite solar cells (PSCs) with p-i-n configuration suffer from low open-circuit voltage (VOC) and fill factor (FF), limiting their application in tandem solar cells. Here, we propose using the fullerene ICBA as the electron charge transporting layer (ETL), forming a better interfacial contact and enhancing the internal quasi-Fermi level splitting (QFLS). A further reduction of VOC losses of around 0.1 V was achieved by an ultrathin phenethylammonium chloride (PEACl) layer between the perovskite and the ETL. We precisely study the VOC improvement and find that passivation of surface recombination contributes only 20 mV, while more importantly, a major increase of 80 mV is achieved by dedoping the perovskite surface, which removes a non-negligible electron extraction barrier. Our results give helpful direction regarding how to further improve VOC in p-i-n perovskite cells.

Passivation

Open-circuit voltage

Tandem

Limiting

10.1021/acsenergylett.3c00173

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Citations (11)

Tailoring the Dimensionality of 2D/3D Heterojunctions for Inverted Perovskite Solar Cells

ACS Energy Letters (2024)

Chaohui Li Kaicheng Zhang Santanu Maiti Zijian Peng Jingjing Tian

Interface engineering is crucial to achieving stable perovskite photovoltaic devices. A versatile approach is developed to tailor interface properties via integrating co-assembled monolayers (co-SAMs) at the p-type buried interface and by capping a two-dimensional (2D) perovskite layer at the n-type upper interface with vacuum quenching. Optimized co-SAMs promote the coverage of the hole transport layer, significantly reducing the incidence of leakage currents. Based on this foundation, we develop damp-heat-stable perovskite solar cells by precisely tailoring the fragments of 2D perovskite layers through vacuum annealing with phenethylammonium iodide. An impressive open-circuit voltage of 1.216 V is achieved, corresponding to 92% of the value determined by the detailed-balance limit, along with a power conversion efficiency of 23.68%. Ultimately, integrating co-SAMs and the vacuum-assisted annealing fabricated devices maintain 96% and 80% of initial efficiencies after 1200 and 500 h of tracking at a maximum power point under 55 and 85 °C, respectively.

10.1021/acsenergylett.4c00045

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Citations (6)