Perovskite-polymer hybrid solar cells with near-infrared external quantum efficiency over 40%

Abstract

an inverted structure (Fig. 1a) of indium tin oxide (ITO)/ poly(3,4-ethylenedioxythiophene) PEDOT: poly(styrenesulfonate) (PSS)/peroskite/ [6,6]-phenyl-C61-butyric acid methyl ester (PCBM)/Al(or Ag) [6−19]. For this type of peroskite/PCBM solar cell, generally only photons in the ultraviolet-visible range (300−800 nm) are harvested in the devices due to the medium optical band gap (~1.55 eV) of CH 3 NH 3 PbI 3-x Cl x or CH 3 NH 3 PbI 3 . Solution-processed polymer solar cells utilizing conjugated polymer and PCBM bulk-heterojunction (BHJ) blend as a light absorber are also a promising photovoltaic technology due to tunable absorption features and energy levels, as well as excellent solution processibility of the diverse polymers [20−29]. Therefore, integrating the advantages of both photovoltaic technologies into a simple photovoltaic device will be of great importance to achieve cost-effective and low temperature processed photovoltaic technologies.It is well-established that nanoscale bicontinuous interpenetrating networks in polymer:PCBM BHJ solar cells are beneficial for realizing efficient exciton dissociation and charge transport [30,31]. Very recently, researchers from polymer solar cell community have introduced feasible strategies to push forward planar junction perovskite/ fullerene solar cells [32−36] In the past several years, conjugated polymers and organometal halide perovskites have become regarded as promising light-absorbing materials for next-generation photovoltaic devices and have attracted a great deal of interest. As the main part of this contribution, we describe the enhancement of near-infrared (NIR) photoresponse of well-known CH3NH3PbI3−xClx-based solar cells by the integration of bulk heterojunction (BHJ) small band gap polymer:fullerene absorbers. Particularly, the integration of a commercially available polymer PDPP3T and PCBM-based BHJ boosts the peak external quantum efficiency (EQE) by up to 46% in the NIR region (800−1000 nm), which is outside of the photoresponsive region (300−800 nm) of conventional perovskite solar cells. This substantial improvement in the EQE over the NIR region offers an additional current density of ~5 mA cm −2 for the control perovskite solar cell, and a high power conversion efficiency (PCE) of over 12% was obtained in the perovskite/BHJ-based solar cells. In addition, the insertion of the BHJ absorber consisting of a small band gap polymer PDTP-DFBT and PCBM also results in nearly 40% EQE for the perovskite/BHJ solar cell. The results also reveal that controlling over the polymer/PCBM weight ratio for a BHJ absorber is the key to achieving the optimal efficiency for this type of perovskite-polymer hybrid solar cell.

Cerium and Ytterbium Codoped Halide Perovskite Quantum Dots: A Novel and Efficient Downconverter for Improving the Performance of Silicon Solar Cells

“…Incident photons of higher energy within UV‐blue wavelengths are absorbed within a short distance from the surface, which results in high recombination loss . Until now, various strategies have been demonstrated on solving this problem, for instance, fabricating different tandem solar cells (such as perovskite/silicon solar cell, polymer/perovskite solar cell, etc.) or inserting various photoluminescent layers in front of the SSCs.…”

Highly Efficient Porphyrin‐Based OPV/Perovskite Hybrid Solar Cells with Extended Photoresponse and High Fill Factor

“…For example, a porphyrin‐based molecule, 5,15‐bis(2,5‐bis‐(2‐ethyl‐hexyl)‐3,6‐di‐thienyl‐2‐yl‐2,5‐dihydro‐pyrrolo[3,4‐c] pyrrole‐1,4‐dione‐5′‐yl‐ethynyl)‐10,20‐bis(5‐(2‐ethylhexyl)‐thienyl)‐porphyrin zinc(II) (DPPEZnP‐TEH) has been shown to be able to extend the photoresponse of the OPV device beyond 800 nm to afford both high J SC and PCE . These materials have the potential to be used for improving the light harvest and efficiency of PSCs by forming hybrid solar cells . In such a hybrid device, charges generated from the bulk‐heterojunction (BHJ) and perovskite layers can be collected by corresponding electrodes via their bipolar transporting properties .…”

Efficiency Improvement of MAPbI3 Perovskite Solar Cells Based on a CsPbBr3 Quantum Dot/Au Nanoparticle Composite Plasmonic Light-Harvesting Layer

“…In addition, the increase in thickness increases the grain boundary and internal defects of the perovskite film, which intensifies the charge recombination [21]. Therefore, enhancing the light absorption of the film without increasing the thickness of the film has become one of the most important topics in the field of thin-film solar cells [22][23][24][25]. One light-harvesting method is to reduce the reflectance of the surface by fabricating a surface structure which distributes the incident light to various angles by reflection, refraction and scattering, thereby increasing the optical path length of the light in the photovoltaic device and improving the light absorption efficiency.…”