Bulk heterojunctions push the photoresponse of perovskite solar cells to 970 nm

To expand the photoresponse of perovskite solar cells, we implanted bulk heterojunctions to make integrated solar cells with a structure of ITO/PEDOT/CH3NH3PbI3/(PDPP3T-PC61BM)/Ca/Al. The new cells gave higher J(sc) than perovskite solar cells due to additional photo-current contribution from the bulk heterojunction. This innovative design shows promise for the development of next-generation solar cells.