Tremendously enhanced photocurrent enabled by triplet–triplet annihilation up-conversion for high-performance perovskite solar cells,Energy & Environmental Science

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Tremendously enhanced photocurrent enabled by triplet–triplet annihilation up-conversion for high-performance perovskite solar cells
Energy & Environmental Science ( IF 32.4 ) Pub Date : 2021-4-19 , DOI: 10.1039/d1ee00631b
Wangping Sheng _{1,

2,

3,

4,

5} , Jia Yang _{1,

2,

3,

4,

5} , Xiang Li _{1,

2,

3,

4,

5} , Gengling Liu _{1,

2,

3,

4,

5} , Zhuojia Lin _{1,

2,

3,

4,

5} , Juan Long _{1,

2,

3,

4,

5} , Shuqin Xiao _{1,

2,

3,

4,

5} , Licheng Tan _{1,

2,

3,

4,

5} , Yiwang Chen _{1,

2,

3,

4,

5}

Affiliation

The limited solar spectrum utilization hinders the further amelioration of the performance of perovskite solar cells (PVSCs). An up-conversion (UC) process extends the spectral absorption of PVSCs from the visible to near-infrared (NIR) range and minimizes the sub-band-gap photon transmission loss. The perovskite-sensitized triplet–triplet annihilation (TTA) from rubrene (Rub) and dibenzotetraphenylperiflanthene (DBP) has shown great potential in UC applications. Herein, the TTA UC mechanism is introduced for the first time into PVSCs for converting NIR photons to visible photons, which facilitates the obvious improvement of photocurrent. Attributed to the TTA UC effect and energy band alignment of the Rub:DBP UC layer with the perovskite, the MAPbI₃ based PVSCs acquire a champion power conversion efficiency (PCE) of 20.18% accompanied by significant enhancements in the short circuit current density (J_sc) and open-circuit voltage (V_oc). In addition, rubrene doping can promote perovskite growth owing to the formation of π-conjugated agglomerates, which serve as the growing sites for perovskite crystallization nuclei. Furthermore, the Rub:DBP-based unencapsulated devices exhibit excellent moisture stability, and maintain more than 80% of the primitive PCE after 14 days of storage under air conditions (50–70% humidity, 25 °C).

中文翻译：

三重态-三重态an灭上转换可极大地增强光电流，从而用于高性能钙钛矿太阳能电池

有限的太阳光谱利用率阻碍了钙钛矿太阳能电池（PVSC）性能的进一步改善。上转换（UC）过程将PVSC的光谱吸收范围从可见光扩展到近红外（NIR）范围，并使子带隙光子传输损耗最小化。来自红荧烯（Rub）和二苯并四苯基过环蒽（DBP）的钙钛矿增感三重态-三重态an灭（TTA）在UC应用中显示出巨大潜力。本文首次将TTA UC机制引入PVSC中，以将NIR光子转换为可见光子，从而促进光电流的明显改善。归因于TTA UC效应和Rub：DBP UC层与钙钛矿MAPbI _3的能带对齐基于PVSC的PVSC的功率转换效率（PCE）为20.18％，同时短路电流密度（J _sc）和开路电压（V _oc）显着提高。此外，由于形成了π-共轭附聚物，红宝石掺杂可以促进钙钛矿的生长，π-共轭附聚物是钙钛矿结晶核的生长位点。此外，基于Rub：DBP的未封装器件具有出色的水分稳定性，并且在空气条件下（50-70％的湿度，25°C）存储14天后，可以保持原始PCE的80％以上。

更新日期：2021-05-10

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