Main observation and conclusion
Recently,the polymer solar cells (PSCs) based on the PM6 and small molecular acceptor (SMA) Y6 have attracted considerable atten-tion in this community for their outstanding photovoltaic performance.As well known,the molecular weight of polymer has dramatic impact on the blend morphology and photovoltaic performance in the polymer solar cells,especially for those polymers with tem-perature-dependent aggregation (TDA) behavior.