Modification of reduced graphene oxide layers by electron-withdrawing/donating units on molecular dopants: Facile metal-free counter electrode electrocatalysts for dye-sensitized solar cells

Jariya Rakspun, Yun-Ju Chiang, Jiann‐Yeu Chen, Chen‐Yu Yeh, Vittaya Amornkitbamrung, Narong Chanlek, Veeramol Vailikhit, Panitat Hasin