Formic acid-engineered PEDOT:PSS for enhanced crystallinity and performance in tin–lead perovskite solar cells

IF 3.5 2区物理与天体物理 Q2 PHYSICS, APPLIED Applied Physics Letters Pub Date : 2025-03-13 DOI:10.1063/5.0254767

Qinglong Jiang, Jiebin Wu, Cheng Chen, Zhenhuang Su, Yuanzhong Liu, Lin Yang, Bingchen He, Xingyu Gao, Fangliang Gao, Linfeng Lu

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引用次数: 0

Abstract

Organic–inorganic hybrid perovskite solar cells (PSCs) have shown tremendous promise due to their excellent optoelectronic properties and cost-efficient fabrication. However, the efficiency of traditional lead halide PSCs is approaching the Shockley–Queisser limit, prompting interest in tin-lead perovskite solar cells (Eg ≈ 1.25 eV) as a candidate for tandem configurations with the potential to surpass this limit. A key challenge lies in optimizing the hole transport layer (HTL), as widely used PEDOT:PSS suffers from high acidity and poor crystallinity, hindering device performance. In this work, we used a formic acid modification of PEDOT:PSS to enhance its conductivity, energy band alignment, and crystallinity. Acid treatment promotes proton transfer, reducing insulating PSS chains and improving phase separation, thereby facilitating efficient hole transport. Tin–lead perovskite films fabricated on formic acid-treated PEDOT:PSS (Fa-PEDOT:PSS) exhibit improved crystallinity, larger grain size, and reduced defect density. Devices incorporating Fa-PEDOT:PSS demonstrate enhanced photovoltaic performance, achieving a power conversion efficiency (PCE) of 21.87% with reduced hysteresis and excellent stability, retaining ∼90% of initial efficiency after 1600 h in an inert atmosphere. These findings highlight the potential of acid-treated PEDOT:PSS as an optimized HTL for tin–lead PSCs, paving the way for high-efficiency, environmentally friendly photovoltaic technologies.

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来源期刊

Applied Physics Letters 物理-物理：应用

CiteScore

6.40

自引率

10.00%

发文量

1821

审稿时长

1.6 months

期刊介绍： Applied Physics Letters (APL) features concise, up-to-date reports on significant new findings in applied physics. Emphasizing rapid dissemination of key data and new physical insights, APL offers prompt publication of new experimental and theoretical papers reporting applications of physics phenomena to all branches of science, engineering, and modern technology. In addition to regular articles, the journal also publishes invited Fast Track, Perspectives, and in-depth Editorials which report on cutting-edge areas in applied physics. APL Perspectives are forward-looking invited letters which highlight recent developments or discoveries. Emphasis is placed on very recent developments, potentially disruptive technologies, open questions and possible solutions. They also include a mini-roadmap detailing where the community should direct efforts in order for the phenomena to be viable for application and the challenges associated with meeting that performance threshold. Perspectives are characterized by personal viewpoints and opinions of recognized experts in the field. Fast Track articles are invited original research articles that report results that are particularly novel and important or provide a significant advancement in an emerging field. Because of the urgency and scientific importance of the work, the peer review process is accelerated. If, during the review process, it becomes apparent that the paper does not meet the Fast Track criterion, it is returned to a normal track.