The present invention relates to a boron-dipyrromethene (BODIPY)-based copolymer, a method for preparing the copolymer, a solar cell including the copolymer, and a method for manufacturing the solar cell. By applying the copolymer of the present invention to a hole transporting layer, a solar cell having improved device characteristics such as charge mobility and power conversion efficiency and allowing those characteristics to be maintained for a long time may be provided.