Data of TEMPO-based FTO|TiO₂|AP11_0.5 sandwich DSSC devices with and without functionalisation with S-TEMPO or S-Benzene with a standard deviation of N = 3 in brackets. (WE = FTO|TiO₂|AP11_0.5 with S-TEMPO or S-Benzene or without, CE = FTO–Pt electrodeposited, electrolyte: 1.2 M LiTFSI, 1.0 M TEMPO and 0.1 M TEMPO(BF₄) in MeCN, 0.07 cm² mask).

Entry	Functionalisation	J sc (mA cm−2)	V OC (V)	FF	η (%)
1	None	1.74 (±0.006)	0.45 (±0.066)	0.46 (±0.004)	3.43 (±0.576)
2	S-Benzene	2.12 (±0.030)	0.38 (±0.050)	0.46 (±0.004)	3.62 (±0.496)
3	S-TEMPO	0.47 (±0.016)	0.42 (±0.028)	0.45 (±0.001)	0.88 (±0.087)