15.6% Efficiency Perovskite Solar Cell Prepared in 50% Relative Humidity Condition
a Sungkyunkwan 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)
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
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 (Tsub) was raised. Pre-heated substrate led to higher photocurrent and voltage than non-pre-heated one. When Tsub 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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