Abstract
In our research, we focus on the calibration of incident photons to electrons conversion efficiency （IPCE） of the bulk hetero-junction structure of polymer solar cells. The charge transport behavior of polymer solar cell under global AM1.5 (AM1.5G, 100mAcm-2) illumination is described by the space charge limited current (SCLC) theory. However, most IPCE measurement are carried under weak light intensity so we can not obtain the real spectral response per wavelength (SR(λ)) . In order to acquire the real SR, we add the light bias source in the IPCE system then the devices can be operated under the strong light intensity. Based on SCLC theory, the relation of photocurrent density and light intensity can be expressed as a power law equation which is I=cPα where α is correct factor when the devices is illuminated under strong light intensity. Finally, we correct the SR(λ) of IPCE system with light bias source by the correct factor, and we get the accurate SR.