Bulk Heterojunction Solar Cell Devices Prepared with Composites of Conjugated Polymer and Zinc Oxide Nanorods

Table 1

Electron transport layer’s surface morphology as the junction of spin-speed of 1000, 2000, 3000, and 4000 round per minute.

ZnO (ETL) spin speed (rpm)	Roughness (RMS) (nm)	Contact angles (°)
1000	~5.92	~77.64
2000	~4.6	~56.64
3000	~3.91	~44.61
4000	~2.86	~38.61