Over 13% Efficient Single‐Component Organic Solar Cells Enabled by Adjusting the Conjugated‐Length of Intermediate PBDB‐T Block

Abstract

Batch-to-batch variation widely exists in conjugated donor-acceptor (D-A) block copolymer materials and plays a crucial role in photovoltaic performance of organic solar cells (OSCs). To investigate the influence of conjugated-length of the intermediate block on the performance of singlecomponent OSC (SCOSCs), herein, four batches of conjugated block copolymers (CBCs, PB-b-PY-1, PB-b-PY-2, PB-b-PY-3, and PB-b-PY-4) are synthesized, which possess different D/A block lengths. As the conjugation length of intermediate D-block increases, the lamellar packing order of these CBCs shows a monotonically increasing trend, leading to stronger absorption spectra in the visible region, efficient charge transfer, and suppressed carrier recombination loss. Consequently, the PB-b-PY-4 device yields a higher efficiency of 13.28% than those of other CBCs. This study demonstrates the effectiveness of the conjugated length of intermediate D-blocks in designing high-performance conjugated D-A block copolymers, which paves the way toward developing high-performance SCOSCs.

S,N-Heteropentacene-based molecular donor–acceptor dyads: structure–property relationships and application in single-material organic solar cells

“…7 Because in comparison to the common biphasic or ternary BHJSCs only one sole photoactive material has to be processed and high long-term stabilities were achieved, 8 SMOSCs are considered attractive candidates for an eased technical production of large-scale organic solar cells. 9 PCEs of >13% have indeed very recently been reported for conjugated D-A block copolymers as photoactive materials 10 and >13% for so-called "double cable" polymers, 11 which represent structurally very complex and polydisperse, less defined systems. Even though molecular D-A dyads and triads reached >5% 12 and with respect to PCE stay somewhat behind the polymers, they are structurally defined and represent reproducible systems.…”

Regulating the Sequence Structure of Conjugated Block Copolymers Enables Large‐Area Single‐Component Organic Solar Cells with High Efficiency and Stability

“…[16][17] A few single-component materials have been developed in recent years, which are mainly based on three types: (1) molecular dyads with dual functions that connect D and A through flexible spacers; [11,[18][19][20] (2) conjugated polymers grafting A units as pendants in the polymer donor side chains; [21][22][23] (3) conjugated block copolymers (CBCs) connecting the polymer D-block and polymer A-block in one polymer chain. [13][14][24][25][26] However, the development of SCOSCs is far behind that of BHJ devices. This phenomenon can be attributed to two main factors.…”

A two-armed skeleton extension strategy for the design of novel spirobifluorene-based small molecule donors

“…During the past two decades, a large number of interdisciplinary approaches have been focused on bulk-heterojunction (BHJ) organic solar cells (OSCs) from both scientific and technological research viewpoints, which have led to remarkable progress and tremendous breakthroughs. [1][2][3][4][5][6] The flexibility, lightness, wearability, biocompatibility, and especially the printability and other advantages of organic solar cells [7][8][9][10] promise unprecedented and innovative applications, while conventional inorganic solar cells are difficult to achieve. To date, under the synergy of molecular structure engineering and device engineering, the PCE of OSCs has exceeded 19%.…”