Stable Inverted Low-Bandgap Polymer Solar Cells with Aqueous Solution Processed Low-Temperature ZnO Buffer Layers

Table 1

Photovoltaic performance parameters for conventional and inverted PSCs with ZnO as ETL under the simulated AM 1.5G illumination of 100 mW/cm² fresh or stored after 625 hours.

Devices	(V)	(mA/cm^2)	FF; (%)	PCE; (%)	(mA/cm^2)	(mA/cm^2)		Ωcm^2
Conventional	0.74	16.22	69.61	8.39	16.26		1.87	1.7
Inverted (annealed in air)	0.74	13.92	69.12	7.12	13.95		2.1	2.3
Inverted (annealed in nitrogen)	0.73	14.07	70.79	7.26	14.1		1.77	2.7
Conventional (625 hours later)	0.75	12.74	65.26	6.26	12.82		1.78	2
Inverted (annealed in air (625 hours later))	0.70	12.56	68.25	5.99	12.58		2.00	1.4