Tailoring low-dimensional CH3NH3PbI3 nanostructures for high efficiency perovskite solar cell

Nam-Gyu Park^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

Invited Speaker, Nam-Gyu Park, presentation 069
Publication date: 5th February 2015

Since the groundbreaking report on long-term durable solid state perovskite solar cell based on organolead halide in 2012, perovskite solar cell has been considered as a promising and potential alternative to silicone or CIGS solar cell due to low-cost and superb perfromance. Here we report on tailoring CH3NH3PbI3 (MAPbI3) perovskite from 3-dimensional (3D) to 1-dimensional (1D) nanostructures and morphology-depedent photovoltaic properties. 3D nanocuboids were prepared by two-step spin-coating method, where cuboid size was controlled by engineering solution concentration. Light harvesting efficiency, hole mobility rate and charge extraction were significantly dependent on the nanocuboid size. I-V hysteresis was also found to be affected by nanocuboid size. Piezoresponse force microscopy studies confirmed that polarization behavior was strongly influenced by the size. 1D nanowire was prepared by means of local dissolution of the PbI2 layer in two-step procedure. Reduction in dimensionality resulted in the hypsochromic shift in both absoprtion and emission spectra, indicative of more localized exciton state in nanowire. 1D structure showed better lateral conductivity and charge separation at HTM interface than 3D nanocuboid. The power conversion efficiency (PCE) of ~17% and ~15% was achieved from 3D nanocuboid and nanowire, respectively. We have also tried to fabricate perovskite solar cell under high relative humidity (RH) outside glove box and attained PCE over 15% from perovskite solar cell prepared at 50% RH. Preliminary results on long-term stability of perovskite solar cell will be a little bit discussed.

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