Optimization of molecular organization and nanoscale morphology for high performance low bandgap polymer solar cells

Abstract

Rational design and synthesis of low bandgap (LBG) polymers with judiciously tailored HOMO and LUMO levels have emerged as a viable route to high performance polymer solar cells with power conversion efficiencies (PCEs) exceeding 10%. In addition to engineering the energy-level of LBG polymers, the photovoltaic performance of LBG polymer-based solar cells also relies on the device architecture, in particular the fine morphology of the photoactive layer. The nanoscale interpenetrating networks composed of nanostructured donor and acceptor phases are the key to providing a large donor-acceptor interfacial area for maximizing the exciton dissociation and offering a continuous pathway for charge transport. In this Review Article, we summarize recent strategies for tuning the molecular organization and nanoscale morphology toward an enhanced photovoltaic performance of LBG polymer-based solar cells.

An alcohol-soluble perylene diimide derivative as cathode interfacial layer for PDI-based nonfullerene organic solar cells

“…reported in literature have increased up to 10% [1][2][3][4][5][6]. Considering that the light-absorbing active layer is always the essential part of OPV devices, most researches are focused on rational design and synthesis of novel polymer donors and acceptors (including fullerene and nonfullerene materials), and optimizing the film morphology [7][8][9]. However, the interfaces between organic active layer and electrodes are also critical in optimizing photovoltaic performance.…”

A simple method to adjust the morphology of gradient three-dimensional PTB7-Th:PC71BM polymer solar cells

“…[1][2][3][4][5] The morphology of BHJ films plays a very important role in the whole performance of BHJ organic solar cells (OSCs). [1][2][3][4][5] The morphology of BHJ films plays a very important role in the whole performance of BHJ organic solar cells (OSCs).…”

Study of Photoelectric Conversion in Benzotrithiophene-Based Conjugated Semiconducting Polymers

“…In addition to the energy alignment, the morphology of the blend films plays a significant role in the device performance. [10][11][12] Therefore, molecular weight, backbone planarity, and solubility are important factors need to be considered.…”