Ali ibn Ja'far asked his brother Imam Musa ibn Ja'far عليه السلام regarding a man, if it is permissible for him to write the Quran on tablets or sheets while not in a state of ablution? Imam عليه السلام said: "No."
Ali Akbar al-Ghaffari
Tahdhīb al-Aḥkām fī Sharḥ al-Muqniʿah, vol. 1, p. 133