[14a-A41-1~11] 12.5 Organic solar cells

△ [14a-A41-6] Carrier injection at the heterointerface of lead halide perovskite solar cells studied by simultaneous time-resolved photoluminescence and photocurrent measurements

〇(M2)Taketo Handa¹, David M. Tex¹, Ai Shimazaki¹, Atsushi Wakamiya¹, Yoshihiko Kanemitsu¹ (1.ICR, Kyoto Univ.)

Keywords:perovskite solar cells, charge carrier injection mechanism, time-resolved photoluminescence measurement

We investigate carrier injection mechanism at the heterointerface of the perovskite CH₃NH₃PbI₃ solar cells utilizing time-resolved PL and simultaneous photocurrent measurements. It is found that EQE of the solar cells decreases under high excitation regime of over 100 nJ cm^-2. A comparison between integrated PL and photocurrent intensities revealed that the decrease of EQE is due to a decrease of the carrier injection efficiency at the heterointerface. We will explain the origin of the decrease of EQE and discuss the condition the carrier injection occurs efficiently.