Photovoltaic(PV) spectroscopy measurem ents at various temperature on self-organized InGaAs/GaAs quantum dots were per formed.Pronounced peaks A and B in the spectra are identified,they represent exc iton emissions from bulk GaAs and InGaAs/GaAs quantum dots respectively.A fast r edshift of exciton line peaks from quantum dots with increasing temperature were observed,it is believed that this unusual temperature behavior is related to th e size inhomogeneous of quantum dots. -