Panchromatic Absorbing Materials: Molecular Design and Challenges in Photovoltaic Applications
Panchromatic absorbing materials are widely regarded as a key strategy for enhancing solar energy utilization and photocurrent generation. However, in artificial molecular systems, broadening the absorption spectrum is often accompanied by fundamental challenges, including bandgap narrowing, poor energy-level alignment, and limited charge-transfer kinetics, indicating that pursuing broadband absorption alone is insufficient to guarantee high photovoltaic performance. This article examines the relationship between design strategies and performance of panchromatic absorbing materials from the perspectives of molecular engineering and photovoltaic devices, with particular emphasis on the delicate balance among molecular electronic structure, charge-transfer characteristics, interfacial energy-level alignment, as well as electron injection, regeneration efficiency, and energy losses. Ultimately, the molecular design of panchromatic photovoltaic materials should move beyond molecular-level optimization toward synergistic tuning among molecules, semiconductors, and electrolytes or active-layer materials, thereby providing concrete conceptual guidance for achieving efficiency optimization rather than simple spectral maximization.