15.6% Efficiency Perovskite Solar Cell Prepared in 50% Relative Humidity Condition

Nam-Gyu Park^a, Jin-Wook Lee^a, Hyun-Seok Ko^a

^aSungkyunkwan University, South Korea, 300 Cheoncheon-dong, Jangan-gu, Suwon, 440, Korea, Republic of

International Conference on Hybrid and Organic Photovoltaics
Proceedings of International Conference on Hybrid and Organic Photovoltaics 2015 (HOPV15)

Roma, Italy, 2015 May 11th - 13th

Organizer: Filippo De Angelis

Oral, Hyun-Seok Ko, presentation 062
Publication date: 5th February 2015

We report here an efficienct method for preparation of CH₃NH₃PbI₃ perovskite solar cell in high relative humidity. CH₃NH₃PbI₃ was formed on mesoporous TiO₂ layer by two-step spin coating method, where sprio-MeOTAD was used as a hole transporting material. Druing the first-step spin-coating procedure to form PbI₂ layer, FTO glass substrate was pre-heated from room temperature (without pre-heating) to 60 ^oC. An average power conversion efficiency (PCE) showed 11.16% without pre-heating, which was improved to 15.31% as the temperature of substrate (T_sub) was raised. Pre-heated substrate led to higher photocurrent and voltage than non-pre-heated one. When T_sub was the same as the coating solution temperature, a PCE was declined to 10.49%. Compared to the non-pre-heated substrate, the pre-heated ones showed unreacted PbI₂ after the second-step spin-coating of CH₃NH₃I as confirmed by X-ray diffraction and time-of-flight secondary ion mass spectroscopy(TOF-SIMS) depth profile analyses. Improved crystallinity of PbI₂ induced by substrate pre-heating is responsible for incomplete conversion of PbI₂ to CH₃NH₃PbI₃. Nevertheless, increases in photocurrent and voltage by pre-heating is attributed to better pore filling and surface coverage of perovskite layer, as confirmed by focused ion beam assisted scanning electron microscopy (FIB-SEM) images, which is associated with morphology of PbI₂ layer. A best PCE of 15.76% was achieved along with photocurrent density of 21.27 mA/cm², voltage of 1.033 V and fill factor of 0.718 from the perovskite solar cell prepared in 50% relative humidity.

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