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Solar energy and other clean energies are emerging and growing rapidly in the globe nowadays. Solar energy with less carbon emission is renewable and clean energy for our living environment. Solar energy can be converted to electricity in photovoltaic (PV) devices, solar cells, or solar thermal/electric power plants. It is a current trend that solar energy becomes the important renewable energy. This special issue addresses the role of the development of solar energy. The themes include fabrication methods, solar cell applications, theoretical analysis, and solar cell development trend. From 28 submissions, 19 papers are published in this special issue. Each paper was reviewed by at least two reviewers and revised according to review comments.

In Chu et al.’s paper, the authors presented the fabrication of large-grain 1.25 𝜇m thick polycrystalline silicon (poly-Si) films via two-stage aluminum-induced crystallization (AIC) for application in thin-film solar cells. In S. Chen et al.’s paper, the authors presented that the reactive sputtering is an effective technique of fabricating aluminum oxide surface passivation film for low-cost high efficiency crystalline silicon solar cells. In I.-J. No et al.’s paper, the authors presented the poly [[9-(1-Octylnonyl)-9H-carbazole-2, 7-Diyl]-2, 5-thiophenediyl-2, 1, 3-benzothiadiazole-4, 7-diyl-2, 5-thiophenediyl]/[6, 6]-phenyl C71 butyric acid methyl ester blend active layers prepared by spray deposition method.