Origin of Open-Circuit Voltage Loss in Polymer Solar Cells and Perovskite Solar Cells

Hyung Do Kim; Nayu Yanagawa; Ai Shimazaki; Masaru Endo; Atsushi Wakamiya; Hideo Ohkita; Hiroaki Benten; Shinzaburo Ito

doi:10.1021/acsami.7b03694

Origin of Open-Circuit Voltage Loss in Polymer Solar Cells and Perovskite Solar Cells

ACS Appl Mater Interfaces. 2017 Jun 14;9(23):19988-19997. doi: 10.1021/acsami.7b03694. Epub 2017 Jun 5.

Authors

Hyung Do Kim¹, Nayu Yanagawa¹, Ai Shimazaki², Masaru Endo², Atsushi Wakamiya², Hideo Ohkita¹, Hiroaki Benten¹, Shinzaburo Ito¹

Affiliations

¹ Department of Polymer Chemistry, Graduate School of Engineering, Kyoto University , Katsura, Nishikyo, Kyoto 615-8510, Japan.
² Institute for Chemical Research, Kyoto University , Gokasho, Uji, Kyoto 611-0011, Japan.

PMID: 28553705
DOI: 10.1021/acsami.7b03694

Abstract

Herein, the open-circuit voltage (V_OC) loss in both polymer solar cells and perovskite solar cells is quantitatively analyzed by measuring the temperature dependence of V_OC to discuss the difference in the primary loss mechanism of V_OC between them. As a result, the photon energy loss for polymer solar cells is in the range of about 0.7-1.4 eV, which is ascribed to temperature-independent and -dependent loss mechanisms, while that for perovskite solar cells is as small as about 0.5 eV, which is ascribed to a temperature-dependent loss mechanism. This difference is attributed to the different charge generation and recombination mechanisms between the two devices. The potential strategies for the improvement of V_OC in both solar cells are further discussed on the basis of the experimental data.

Keywords: charge generation mechanisms; charge recombination mechanisms; open-circuit voltages; organic−inorganic perovskites; polymer solar cells.