In the perovskite/polymer based parallel-like tandem solar cell, the distinctive absorption spectra between the organic-inorganic halide perovskite absorber (CH3NH3PbI3 (MAPI)) and poly-(diketopyrrolopyrrole-terthiophene) (PDPP3T) polymer absorber make it possible to investigate the electronic properties of charge carriers generated in either the perovskite or PDPP3T layer separately. The current density-voltage (J-V) curves of the device are measured under the monochromatic LED irradiation at significantly different wavelengths to confirm the charge carrier generated in MAPI offer higher Voc. The voltage biased external quantum efficiency (EQE) measurement is employed to understand the charge transport mechanism in the system. The J-V curves and EQE data confirm that charge carriers generated by the photons absorbed in the perovskite layer or in PDPP3T behave independently. Compared with the bulk heterojunction structure, this parallel-like tandem structure increases Voc while reducing thermalization loss, providing a possibility to break the traditional Shockley-Queisser (S-Q) limit set for single junction devices.
All Science Journal Classification (ASJC) codes
- Renewable Energy, Sustainability and the Environment
- Materials Science(all)
- Electrical and Electronic Engineering