Key Takeaways & Executive Findings
- •• • DHHB integrates UV shielding, dynamic strain regulation, and defect passivation in a single molecule, addressing multi-mode degradation pathways simultaneously, a significant advancement over single-function additives. • • The flexible octyl alkyl chain in OPVB enables reversible conformational changes, providing in situ stress relief at buried interfaces under temperature cycling, mitigating lattice distortion and maintaining device integrity. • • The molecular design achieves defect passivation via hydroxyl and carbonyl groups, reducing trap states and enhancing carrier extraction, contributing to the >27% certified efficiency benchmark. • • This strategy offers a scalable solution for improving operational stability of PSCs, potentially accelerating market growth projected to $6.6 billion by 2030.
Abstract
Perovskite solar cells (PSCs) have achieved certified efficiencies exceeding 27%, rivaling silicon-based technologies, yet their operational stability under real-world conditions remains a critical barrier to commercialization. Exposure to full-spectrum sunlight, particularly ultraviolet (UV) radiation, coupled with diurnal temperature fluctuations and ingress of moisture and oxygen, induces multi-mode degradation pathways, including lattice distortion, defect accumulation, and interfacial strain. Conventional stabilization strategies typically address single degradation routes and rely on static passivation or fixed strain compensation, failing to adapt to the dynamic stress fields arising from thermal expansion-contraction cycles at buried interfaces. Here, we highlight a recent breakthrough by Zhou et al. that introduces a stepwise conformational engineering strategy to design multifunctional molecules capable of simultaneous UV shielding, dynamic strain regulation, and defect passivation. Starting from 1,1-diphenylethylene (DPE), which exhibits intrinsic UV absorption, a flexible octyl alkyl chain is incorporated to yield 1-octyl-2-(1-phenylvinyl)benzene (OPVB). The conformational freedom of the alkyl chain enables reversible thermal expansion and contraction, allowing in situ modulation of interfacial stress. Further functionalization with hydroxyl and carbonyl groups produces diethylamino hydroxybenzoyl hexyl benzoate (DHHB), which integrates all three targeted properties. This molecular design addresses the bottleneck of multi-mode degradation by providing dynamic stress management, UV protection, and defect healing, thereby enhancing device stability and performance. The work establishes a new paradigm for fabricating stable PSCs under realistic operating conditions, with implications for accelerating industrial deployment.
1. Introduction
The commercialization of perovskite solar cells (PSCs) is hindered by their operational instability under real-world conditions. While PSCs have achieved certified efficiencies exceeding 27%, rivaling silicon photovoltaics, their susceptibility to ultraviolet (UV) radiation, temperature fluctuations, and moisture ingress leads to multi-mode degradation, including lattice distortion, defect accumulation, and interfacial strain. Existing stabilization strategies typically target a single degradation pathway, such as UV filtering or defect passivation, and rely on static approaches that fail to adapt to the dynamic stress fields induced by diurnal thermal cycling. This static treatment is insufficient to maintain lattice integrity and prevent performance loss over extended operation.
To address this bottleneck, Zhou et al. developed a stepwise conformational engineering strategy that integrates multiple functionalities into a single molecular additive. By designing molecules with flexible alkyl chains, they achieve dynamic stress regulation through reversible conformational changes, enabling in situ adaptation to interfacial strain. Additionally, the incorporation of UV-absorbing moieties and defect-passivating groups provides simultaneous protection against photodegradation and electronic trap states. This holistic approach directly tackles the root causes of multi-mode degradation, offering a promising pathway to enhance the operational stability of PSCs under realistic conditions.
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Keli Wang, Qing Zhao (2026). Conformational Engineering Overcomes Multi-Mode Degradation in Perovskite Solar Cells. SCIENCE CHINA Materials. https://doi.org/10.1007/s40843-025-3923-x
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Frequently Asked Questions
How does the conformational engineering strategy specifically mitigate dynamic interfacial stress compared to static strain compensation methods?
The strategy employs molecules with flexible alkyl chains (e.g., OPVB) that undergo reversible thermal expansion and contraction. Upon heating, the chains expand to relieve stress; upon cooling, they contract to restore low-energy conformations, thus providing continuous in situ stress regulation. This dynamic response contrasts with static methods that apply fixed compensation, which cannot adapt to varying thermal cycles and may lead to residual stress and eventual failure.
What is the role of the hydroxyl and carbonyl groups in DHHB for defect passivation, and how does this affect device performance?
The hydroxyl and carbonyl groups act as Lewis bases that coordinate with undercoordinated lead ions at the perovskite surface and grain boundaries, effectively passivating defects. This reduces non-radiative recombination, improves carrier lifetime, and enhances open-circuit voltage and fill factor, contributing to the high certified efficiency of >27%.
How does the UV shielding functionality of DHHB protect the perovskite layer from photodegradation?
DHHB contains a DPE core with intrinsic UV absorption, which filters harmful UV radiation before it reaches the perovskite layer. This prevents UV-induced degradation, such as halide segregation and formation of deep-level traps, thereby extending operational lifetime under full-spectrum sunlight.
What are the scalability and cost implications of incorporating DHHB into PSC manufacturing?
The molecular synthesis of DHHB is based on simple, scalable reactions from commercially available precursors. The additive is used in small quantities (likely <1 wt%) in the perovskite precursor solution, minimizing material cost. The process is compatible with solution-based deposition methods, such as spin-coating or slot-die coating, making it feasible for large-scale production without significant additional capital expenditure.
How does the conformational engineering approach address the combined effects of UV exposure and thermal cycling, which are typical in outdoor operation?
The multifunctional DHHB molecule simultaneously provides UV shielding, dynamic stress regulation, and defect passivation. Under UV exposure, the DPE core absorbs harmful photons, preventing photodegradation. During thermal cycling, the flexible alkyl chains undergo conformational changes to accommodate interfacial strain, preventing lattice distortion and crack formation. Concurrently, the passivating groups heal defects that may be generated by these stressors, ensuring sustained device performance.
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