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DOE OSTI · 1343576

Room-temperature, solution-processable organic electron extraction layer for high-performance planar heterojunction perovskite solar cells

Kim, Jong H.·Chueh, Chu-Chen·Williams, Spencer T.·Jen, Alex K. -Y.
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Abstract

Here in this work, we describe a room-temperature, solution-processable organic electron extraction layer (EEL) for high-performance planar heterojunction perovskite solar cells (PHJ PVSCs). This EEL is composed of a bilayered fulleropyrrolidinium iodide (FPI)-polyethyleneimine (PEIE) and PC 61 BM, which yields a promising power conversion efficiency (PCE) of 15.7% with insignificant hysteresis. We reveal that PC 61 BM can serve as a surface modifier of FPI-PEIE to simultaneously facilitate the crystallization of perovskite and the charge extraction at FPI-PEIE/CH 3 NH 3 PbI 3 interface. Furthermore, the FPI-PEIE can also tune the work function of ITO and dope PC 61 BM to promote the efficient electron transport between ITO and PC 61 BM. Based on the advantages of room-temperature processability and decent electrical property of FPI-PEIE/PC 61 BM EEL, a high-performance flexible PVSC with a PCE ~10% is eventually demonstrated. Lastly, this study shows the potential of low-temperature processed organic EEL to replace transition metal oxide-based interlayers for highly printing compatible PVSCs with high-performance.

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14 SOLAR ENERGY36 MATERIALS SCIENCE

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Kim, Jong H., Chueh, Chu-Chen, Williams, Spencer T., Jen, Alex K. -Y.. 2015-09-24. Room-temperature, solution-processable organic electron extraction layer for high-performance planar heterojunction perovskite solar cells. https://doi.org/10.1039/c5nr04250j

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