Transparent Hole‐Transporting Frameworks: A Unique Strategy to Design High‐Performance Semitransparent Organic Photovoltaics

Abstract

feature advantages, such as light weight, low-cost, flexibility, solution-processability, and feasibility of easy and large-area fabrication, have drawn considerable attentions recently. [1-7] In the last three years, although OPV developed rapidly with power conversion efficiencies (PCEs) up to 16-17%, [8-14] it still cannot compete with inorganic PVs (such as silicon, Cu(In, Ga)Se 2 , and GaAs) which hold PCEs of 23-28%. [15] However, thanks to the nature of molecular orbitals, the absorption spectra of organic semiconductors are not continuous as those in traditional inorganic semiconductors, and this characteristic offers a unique application of OPVs: semitransparent OPVs. The concept of semitransparent OPVs was first reported by our group [16] and Forrest and co-workers [17] in 2006. Semitransparent OPVs are OPV devices with semitransparent absorption spectrum in the visible region (400-700 nm), and they show great potentials for future applications. [18-20] For example, they can be equipped in agricultural greenhouses, or can be used as building-integrated photovoltaics. At the early stage (2006-2016) of semitransparent OPVs' development, their active layers were based on medium-or narrow-bandgap polymer donor/[6,6]-phenyl-C61-butyric acid methyl ester

High-performance and eco-friendly semitransparent organic solar cells for greenhouse applications

“…21 Previous studies have demonstrated that ST-OSCs that bear ternary absorber layers (J52:IEICO-4F:PC 71 BM) and possess the tailored action spectra for plants, achieved PCE of 7.75% and plant growth factor (G) of 24.8%, 7 wherein G reflects plant photosynthesis rate under the filtered light through semitransparent solar cells. 22,23 To quantitatively assess the impact of semitransparent devices on plant growth, G is employed to define the light transmittance properties of the ST-OSCs, wherein G reflects plant photosynthesis rate under the filtered light through semitransparent solar cells (Please see Supplemental information for the detailed equation). 7,9 Recently, foldable ST-OSCs based on PBDB-TF:Y6 binary blend have obtained greater than 10% efficiency and 21% AVT, 6 with parallel comparisons of plants grown under direct light and the ST-OSC-filtered light showing a similar trend.…”

Spin‐Optoelectronic Phenomena for a Semitransparent Nonfullerene Photovoltaic System

“…[ 18–20 ] It has witnessed some excellent achievements on the roadmap for the development of NFA‐based ST‐OSCs. [ 10,11,21–26 ] Despite this, the interior photophysical and spin‐related phenomena can be incredibly rich in the NFA semitransparent system. [ 9,27 ] Some parts of the molecular dynamics are novel and contradict the fullerene system, for example, the low driving force induced charge dissociation and ultrafast hole transfer.…”

Improving the Photostability of Small-Molecule-Based Organic Photovoltaics by Providing a Charge Percolation Pathway of Crystalline Conjugated Polymer

“…They have versatile molecular structures, a well-defined molecular weight, a fine-tunable molecular energy level, and less batch-to-batch variations. Recently, a breakthrough has been achieved in the field of SM-OPVs: power conversion efficiencies (PCEs) of over 14% have been successfully demonstrated [4][5][6][7][8][9][10][11][12][13][14][15][16][17].…”